Java Edition 1.13

1.13, also known as the Update Aquatic, is an upcoming major update to Java Edition planned to be released on July 18, 2018. It will focus mainly on ocean content and technical features. This update was originally intended to be released as two separate updates with 1.13, originally named Technically Updated, having the technical changes and 1.14, originally named Update Aquatic, having all the ocean features. The update was originally revealed during the MineCon Earth livestream on November 18, 2017.

Initially, 1.13 was scheduled to be released on May 30, 2018. However, the release has been pushed to July 18, 2018 to fix critical bugs.

Blocks

 * Air variants
 * and.
 * Both have the exact same properties as.
 * is generated in caves.
 * is used internally for blocks above (>255) and below (<0) the world, and in unloaded chunks.


 * Blue ice
 * Generates in icebergs.
 * More slippery than ice and packed ice.
 * Crafted using 9 packed ice.


 * Bubble columns
 * Created by magma blocks or soul sand in water at least 2 blocks deep.
 * Magma block columns pull entities down: they will stop items from floating up in water and sink boats.
 * Soul sand columns push entities up.


 * Buttons, pressure plates and trapdoors
 * Now have separate textures for all 6 types of wood.


 * Carved pumpkin
 * A new block that has the old pumpkin texture.
 * Normal pumpkin blocks no longer have a face.
 * Right-clicking a pumpkin block with shears will turn it into a carved pumpkin and make it spit out 4 pumpkin seeds.


 * Conduit
 * Crafted using 1 Heart of the Sea and 8 Nautilus Shells.
 * Can be activated by placing prismarine, dark prismarine, prismarine bricks and/or sea lanterns in 5x5 open squares around it.
 * When active, will affect nearby players in water with the Conduit Power status effect.
 * Conduit power stops the breath meter from running out, gives underwater night vision and increases mining speed.
 * A complete structure will fully power the conduit.
 * When active at full power, the range will increase and hostile mobs within 8 blocks will take damage.
 * The eye of the conduit will show whether it's hunting for hostile mobs or not: it will show an open eye when it's looking out for hostile mobs, and a closed eye otherwise.
 * Emits a strong glow, at light level 15.


 * Coral
 * Comes in 5 different variants, each with a different color: tube (blue), brain (pink), bubble (purple), fire (red), horn (yellow).
 * Can only be placed underwater.
 * Naturally generates in coral reefs.


 * Coral block
 * Comes in the same 5 variants as coral: tube (blue), brain (pink), bubble (purple), fire (red), horn (yellow).
 * Must be mined with a Silk Touch tool in order to drop itself, otherwise they drop a dead coral block.
 * Each variant has a dead (gray) counterpart.
 * Turns into a dead coral block if none of its six sides are touching water, although not instantly.
 * Dead coral blocks cannot be revived.
 * Like coral, it naturally generates in coral reefs.


 * Coral fans
 * Can be placed underwater on the side of blocks.
 * Naturally generates on the sides of coral blocks in coral reefs.


 * Dried kelp block
 * Smelts 20 items when used as fuel in a furnace.
 * Crafted from dried kelp, and can also be crafted back into dried kelp.


 * Kelp
 * Can only be placed underwater, requiring at least one water block above it.
 * Can be placed on dry land by using the command.
 * Generate in ocean biomes, except warm oceans.
 * Can grow multiple blocks high.
 * Has animated textures.
 * Can be smelted into dry kelp.


 * Prismarine stairs and slabs
 * Both come in all 3 variants: prismarine, dark prismarine, and prismarine bricks.
 * Stairs can be crafted with 6 of their respective material.
 * Slabs can be crafted with 3 of their respective material.


 * Seagrass
 * Like kelp, seagrass also comes in a tall variant.
 * Has animated textures.
 * Generates in oceans (including underwater caves), rivers, and swamplands.
 * Can additionally be generated when bone meal on any block underwater.
 * Drops from turtles when killed.


 * Sea pickles
 * They generate in warm oceans, especially around coral reefs.
 * Up to 4 of them can be placed on a block.
 * Each one adds 3 to the light level, but only when placed underwater.
 * Can be smelted into lime dye.


 * Shulker Boxes
 * Added a non-dyed shulker box.


 * Stripped bark
 * A variant of bark with the side texture or stripped logs on all faces.
 * Created by an axe on a bark block.
 * Act as regular logs, and can still be used to craft planks.


 * Stripped logs
 * A barkless variant of logs.
 * Created by an axe on a log block.
 * Act as regular logs, and can still be used to craft planks.


 * Turtle eggs
 * Created by breeding turtles.
 * Stepping on turtle eggs will break them.
 * Zombies and zombie pigmen will intentionally step on turtle eggs.
 * After a while, they will become slightly cracked and then very cracked.
 * Very cracked turtle eggs will eventually hatch into baby turtles.

Items

 * Arrow of Slow Falling
 * Gives the player the Slow Falling status effect.


 * Arrow of the Turtle Master
 * Functions the same as the potion of the Turtle Master.


 * Bark blocks
 * Now have an item form and appear in the creative inventory.
 * This is true for all 6 types.
 * They can now be crafted, 4 logs in a square yield 3 bark.
 * They now follow identical placement rules to logs and other such blocks.


 * Buried treasure exploration maps
 * Found in underwater ruins chests.
 * Leads the player to buried treasure.


 * Debug stick
 * A technical item used to cycle between different block states.
 * Left clicking cycles through states; right clicking cycles through values. Shift clicking will cycle through the states or values in reverse order.


 * Dried kelp
 * Obtained from smelting kelp.
 * Can be eaten, restoring hunger point.
 * Can also be crafted into dried kelp blocks.


 * Fish buckets
 * Come in 4 variants: cod, salmon, pufferfish, and tropical fish buckets.
 * Obtained by a water bucket on a fish mob.
 * When, it will place a water source block and spawn the corresponding fish inside it.


 * Heart of the Sea
 * Used to craft conduits.
 * They generate in buried treasure chests (in stacks of 1).


 * Kelp
 * Can be used to place a kelp plant underwater.
 * Can be dried in a furnace to create dried kelp.


 * Mushroom blocks
 * Now appear in the creative inventory.
 * Mushroom stems
 * Have an item form and appear in the creative inventory.


 * Nautilus Shell
 * Used to craft conduits.
 * Can be obtained by fishing.
 * Drowned can spawn holding a nautilus shell.


 * Petrified oak slab
 * Now has a model.
 * Is the old wood slab that acts like a stone slab.


 * Phantom membrane
 * Dropped by phantoms.
 * Used to repair elytra.
 * Can be brewed into potions of Slow Falling.


 * Potion of Slow Falling
 * Brewed with phantom membrane.
 * Gives the player the Slow Falling status effect for 1:30.
 * Prevents all fall damage.
 * Makes the player fall slower.
 * Prevents the player from trampling crops (even when jumping on top of them).
 * Brewing it with redstone dust will extend the effect duration to 4 minutes.
 * Like all potions, can be turned into splash potion and lingering potion, using gunpowder and dragon's breath.


 * Potion of the Turtle Master
 * Will give Slowness IV and Resistance III for 1 minute.
 * Brewing it with redstone dust will extend the effect duration to 3 minutes.
 * Brewing it with glowstone dust will enhance the effects to Slowness VI and Resistance IV.
 * Like all potions, can be turned into splash potion and lingering potion, using gunpowder and dragon's breath.


 * Scutes
 * Dropped when baby turtles grow up.
 * Can be used to craft turtle shells.
 * Smooth quartz, smooth red sandstone, smooth sandstone, and smooth stone
 * Like bark, they now have an item form, which appears in the creative inventory.


 * Spawn eggs
 * Drowned
 * Phantom
 * Dolphin
 * Turtle
 * Cod
 * Salmon
 * Pufferfish
 * Tropical fish


 * Trident
 * A new weapon.
 * Can be thrown by it, or be used as a melee weapon by, dealing  damage.
 * Obtainable by killing drowned.


 * Turtle shells
 * Crafted from scutes.
 * Can be used as a helmet, adding 2 armor points.
 * While equipped and out of water, it will give the player the Water Breathing effect for 10 seconds, essentially giving the player 10 extra seconds of breath underwater.
 * Can be used to brew the potion of the Turtle Master from an awkward potion.

Mobs

 * Dolphins
 * Spawn in any ocean that isn't frozen.
 * Neutral mobs. Like wolves and zombie pigmen, dolphins will attack in groups if one is angered.
 * Can be fed using raw cod, but they don't breed.
 * Drop cod on death.
 * Play with nearby items by picking them up and dropping them after a very short moment.
 * Occasionally jumps out of water like real-life dolphins.
 * Can also jump between disconnected bodies of water.
 * Chase after boats and jump over water surfaces.
 * They suffocate after spending too much time on land.
 * If they start drowning, they will swim to the surface.
 * Give the player the Dolphin's Grace status effect when the player swims near them.
 * They can help players find buried treasure; when they are fed raw cod, they will swim to the nearest shipwreck or underwater ruins.


 * Drowned
 * Spawn in all oceans and rivers, as well as in underwater ruins.
 * Zombies will morph into drowned after a while if they are in water.
 * Drowned can spawn with tridents and nautilus shells, allowing you to get them in survival.
 * Do not float, but can swim (although they prefer to walk).
 * All drowned have a melee attack, and ones with tridents have a ranged attack.
 * Like zombies, drowned will attack baby turtles and stomp on and destroy turtle eggs.


 * Fish mobs
 * Cod
 * Spawn in cold, normal, and lukewarm ocean biomes.
 * Form groups of up to 9.
 * Salmon
 * Spawn in frozen ocean, cold ocean and river biomes.
 * Form groups of up to 6.
 * Pufferfish
 * Spawn in lukewarm and warm ocean biomes.
 * Inflate themselves when a player gets near.
 * Will cause 7 seconds of Poison to nearby players.
 * Tropical Fish
 * Spawn in lukewarm and warm ocean biomes.
 * Come in 14 different colors and patterns.
 * They drop themselves when killed.
 * Outside of water, they flop around before suffocating.
 * They will slowly flop towards a water source.
 * They can be caught with a water bucket.


 * Phantoms (Mob B)
 * Was voted in by viewers of MineCon Earth.
 * Spawn in the Overworld at high altitudes, and swoops down in groups of around 3 or 4 to attack players that have not slept in a while.
 * The player must be above sea level.
 * Are considered to be undead mobs.
 * This means that they are harmed by Healing potions, healed by Harming potions, ignored by the Wither, and affected by Smite enchantment.
 * Will burn when exposed to sunlight.
 * Drop 0-1 phantom membrane.


 * Turtles
 * Water mobs which will make nests comprised of eggs on shorelines throughout various biomes.
 * Have a baby variant, which hatch from the eggs, and move into the water when born.
 * Can be bred using seagrass.
 * Spawn on warm beaches (in plains, jungles, swamps, deserts, mesas and savannahs), in groups of 1-5. This is temporary.
 * Lay eggs in their home beach.
 * Drop 0-2 sea grass upon death.
 * Drop 0-1 bowl when killed with a trident enchanted with Channeling.
 * You can craft scutes into a bigger turtle shell.

World generation

 * Biomes
 * Added  (Small End Islands),   (End Midlands),   (End Highlands), and   (End Barrens).
 * All 4 generate in different parts of the outer islands of the End, which previously just used the "The End" biome.
 * Added  (Warm Ocean),   (Lukewarm Ocean),   (Cold Ocean),   (Deep Warm Ocean),   (Deep Lukewarm Ocean),   (Deep Cold Ocean), and   (Deep Frozen Ocean), although warm deep oceans don't naturally generate.
 * (Frozen Ocean) now generates again.


 * Buffet
 * New world type: can be created by selecting Buffet World as a world type.
 * Creates single-biome worlds.
 * Another way to generate chunks is available.
 * Allows choosing between Overworld (as "Surface"), Nether (as "Caves") and End (as "Floating islands") terrain generation.
 * Biome names are sorted alphabetically in the buffet menu.


 * Buried treasure
 * A new structure that consists of a buried chest with loot in it.
 * Has its own  loot table.
 * Maps found in underwater ruins can lead you to them.


 * Coral reefs
 * Naturally generate in warm ocean biomes.
 * Are composed of coral, coral blocks and coral fans.


 * Icebergs
 * Generate on frozen oceans.


 * Shipwrecks
 * Can be found in oceans and beaches.
 * Contain 1–3 loot chests containing different types of loot depending on the ship.
 * Can generate upright, sideways or upside down.
 * Underwater caves
 * Come in many variants, including ravines.
 * Underwater ravines will often contain magma blocks at the bottom, which will create bubble columns.


 * Underwater ruins
 * Come in many different shapes and sizes.
 * Cold ruins can be found in cold and frozen ocean biomes - regardless of depth.
 * Warm ruins can be found in warm, lukewarm, and deep lukewarm ocean biomes.
 * Can generate alone or as part of a big ruined village.
 * Can also generate out of the water, slightly underground or slightly above sea level.

Gameplay

 * Enchantments
 * Channeling
 * Only has one level.
 * Used on tridents to summon a lightning bolt on impact with a mob during storms.
 * Requires the target mob to be directly under an open sky and in a biome where it is raining.
 * Impaling
 * Goes up to level V.
 * Used on tridents to deal more damage to sea creatures.
 * Loyalty
 * Goes up to level III.
 * Used on tridents to make it return when thrown.
 * Riptide
 * Goes up to level III.
 * Not compatible with Loyalty or Channeling.
 * Used on tridents to launch the player when thrown while in water or rain. Riptide will not throw the trident, but instead launch you forwards.
 * If the player is not in water and it is not raining, the player is not able to throw tridents enchanted with Riptide, but they can still deal melee damage.
 * Players display a spinning animation when dashing.


 * Map markers
 * Added the ability to put markers on maps.
 * on a banner with a map to add it to the map.
 * Right click on the same banner again to remove it.
 * That map will show the base color of the banner at that spot.
 * Named banners will show their name on the map.
 * If a banner is destroyed, it will disappear when you get close while holding the map.
 * Uses the new  nbt for maps.


 * Movement
 * When sprinting while in water, the player will now swim on the surface.
 * Much faster than walking/running in water before.
 * Pressing shift causes the player to rapidly dive down.
 * Sprinting at the surface of water doesn't make you swim, instead you stay at the same altitude constantly.
 * The players hitbox is only as large as 0.6×0.6 blocks (same as while flying with an elytra) while swimming.
 * Vertically and horizontally, the player can fit through a one block gap like this.

Command format

 * General
 * Added a command UI that shows when commands are typed in the chat.
 * Different components of commands will be displayed in different colors.
 * Errors will be displayed in red without having to run the command.
 * Added command suggestions for entity selectors.
 * An  argument in target selectors.
 * A new command parsing library known as brigadier.


 * Coordinates
 * Added a new local coordinate type in commands using.
 * When specifying coordinates in a command, you can now use  to specify local coordinates instead of world coordinates.
 * The axes used for local coordinates are relative to the execution rotation, defaulting to  (south).
 * Like world coordinates, they are by default measured from the base of an entity.
 * The syntax is:.
 * is the amount of blocks in the specified direction.


 * Specific commands


 * A command that allows the player to get, merge, and remove entity and block nbt data.
 * Will return the NBT data from the block at . A   can be specified to only retrieve that nbt data. Numeric values will be set as the   of the command, strings will set the length of the string as the , lists will set the number of elements in the list as the  , and compounds will set the number of tags that are directly in that compound as the  . An optional   can be provided to scale the number retrieved.
 * Will return the NBT data from one  entity. A   can be specified to only retrieve that nbt data. Numeric values will be set as the   of the command, strings will set the length of the string as the , lists will set the number of elements in the list as the  , and compounds will set the number of tags that are directly in that compound as the  . An optional   can be provided to scale the number retrieved.
 * Will merge the block nbt data at  with the specified   data.
 * Will merge the entity nbt data from  with the specified   data. Merging player nbt data is not allowed.
 * Will remove nbt data at  from the block at.
 * Will remove nbt data at  from one   entity. Removing player nbt data is not allowed.
 * Data paths look like this:.
 * means foo's child called bar.
 * means element 0 of bar.
 * "quoted strings" may be used if a name of a key needs to be escaped.
 * Examples of old commands:
 * is now
 * is now
 * Examples of new functionalities:
 * means foo's child called bar.
 * means element 0 of bar.
 * "quoted strings" may be used if a name of a key needs to be escaped.
 * Examples of old commands:
 * is now
 * is now
 * Examples of new functionalities:


 * A command to control loaded data packs.
 * Has the following subcommands:
 * - will enable the specific pack.
 * - will disable the specific pack.
 * - will list all data packs, or only the available/enabled ones.
 * Data packs are enabled by default, but if you disable it you can re-enable it with these commands:
 * - will enable the specific pack, putting it in its default position.
 * - will enable the specific pack, putting it before any other pack (lowest priority).
 * - will enable the specific pack, putting it after any other pack (highest priority).
 * - will enable the specific pack, putting it before (lower priority) pack.
 * - will enable the specific pack, putting it after (higher priority) pack.
 * - will enable the specific pack, putting it after (higher priority) pack.


 * will create a boss bar.
 * is used to target the boss bar and is in the form, for example:  . If no   is specified it defaults to.
 * is the display name of the boss bar and only accepts a JSON text component.
 * will change the name of the boss bar.
 * will change the color of the text (if no color was specified as part of a text component) and the boss bar, defaults to.
 * will change the style of the boss bar, defaults to.
 * Available options are:,  ,  ,  , and.
 * will set the amount of segments.
 * will set the amount of segments to 1.
 * will change the current value of the boss bar, defaults to.
 * will change the maximum value of the boss bar, defaults to.
 * will change the visibility of the boss bar, defaults to.
 * will change which players can see the boss bar, defaults to none.
 * will remove the boss bar.
 * will display a list of created boss bars.
 * will return the requested setting as a  of the command.
 * will return the requested setting as a  of the command.


 * Added a clickable teleport link to the command output.
 * Added a clickable teleport link to the command output.


 * Added.
 * Will rotate an entity to face either an entity or a location.
 * Will rotate an entity to face either an entity or a location.
 * Will rotate an entity to face either an entity or a location.


 * Added  and   to.
 * Added  and   to.

General

 * Advancements
 * Added 4 new advancements.
 * Fishy Business: Catch a fish.
 * Tactical fishing: Catch a fish... without a fishing rod!
 * A Throwaway Joke: Throw a trident at something.
 * Very Very Frightening: Strike a Villager with lightning.
 * Added three new advancement triggers.
 * minecraft:fishing_rod_hooked triggers when a player reels in an item or entity.
 * minecraft:channeled_lightning triggers when a player uses the channeling enchantment to strike a mob.
 * minecraft:filled_bucket triggers when a player fills a bucket.


 * Data packs
 * Like resource packs, but for loot tables, advancements, functions, structures, recipes and tags.
 * Used by placing them into the  folder of a world.
 * Data packs are  files or folders, with a   in the root. See: Tutorials/Creating a resource pack. The packs are located in.
 * Structures will load from  before checking data packs.
 * However, this directory should not be used to distribute structures. Instead, move these files into data packs.
 * Reloadable using.
 * Structure:,   folder containing a namespace folder determining the namespace of its contents.
 * A namespace should only contain the following symbols: 0123456789abcdefghijklmnopqrstuvwxyz-_
 * Inside the namespace folder, there can be folders for,  ,  ,  ,   and.


 * Death Messages
 * Added a death message for when the player is blown up by a bed in the nether or end.
 * Clicking on "[Intentional Game Design]" opens a link to.
 * Added a death message for when a mob/player pushes someone into the void or when someone uses after being attacked by a mob/player.
 * Added a death message for when the player is killed by somebody using a trident.
 * Added a death message for when the player is killed by somebody using a trident.
 * Added a death message for when the player is killed by somebody using a trident.


 * Debug screen
 * will now copy your current location to clipboard.
 * Now gives a warning before forcing a debug crash.
 * F3 debug overlay now shows the fluid you're looking at, separately from blocks.
 * Player can be up to twenty blocks away for this to work now.
 * Added to copy the client-side data of targeted block or entity. It can be used by anyone.
 * Added to copy targeted block or entity server-side data to clipboard. It can only be used by operators.
 * Added information about the time it takes for a tick on the integrated server (singleplayer only), server brand (multiplayer only), number of packets sent by the client (tx), and number of packets received by the client (rx).


 * Loot tables
 * Added the  function to loot tables.


 * NBT tags
 * Added the,  ,  ,  , and   NBT tags for dolphins.
 * Added the,  ,  , and   NBT tags for phantoms.
 * Added the,  ,  ,  ,  ,  , and   NBT tags for turtles.


 * Options
 * FS (Fullscreen) Resolution to change the resolution.
 * Options when editing a world to make a backup and open the backups folder.
 * Added Biome Blend distance video option.
 * New options in options.txt:
 * autoSuggestions
 * An option in chat settings to toggle automatic command suggestions
 * True if brigadier's command suggestion UI should always be shown, instead of just when pressing tab
 * Defaults on, otherwise hit tab to bring them up
 * glDebugVerbosity
 * LWJGL log info level (0: none, 1: HIGH, 2: MEDIUM, 3: LOW, 4: NOTIFICATION (only on some machines)
 * mouseWheelSensitivity
 * Affects hotbar scroll speed
 * Allows making the mouse wheel more sensitive (1.0-10.0)
 * Defaults to 1.0
 * Letter keys in controls are now lowercase instead of being capitalized.


 * Particles
 * Added the,  ,  , and   particles.


 * Sounds
 * Added a new sound effect of squids shooting ink.
 * Added sound for Husks converting to Zombies
 * Added underwater ambience sounds.
 * New ambience sound: Cave19.ogg.
 * Added new sound events:
 * ,,  ,  , and
 * Used for the living coral blocks.
 * Most of these sounds like mixture of rocky and high-pitched slimy sounds.
 * ,,  ,  , and
 * Used for seagrass, kelps, corals and coral fans.


 * Splashes
 * Added "All rumors are true!"
 * Added "Thanks for the fish!"


 * Statistics
 * Added the  statistic.
 * Used by phantoms.
 * Reset when the player leaves their bed, and when the player dies.


 * Status effects
 * Added Conduit Power status effect.
 * Gives the player unlimited water breathing.
 * Gives the player underwater night vision effect.
 * Gives the player a haste effect (allowing them to mine faster underwater).
 * Added Dolphin's Grace status effect.
 * Makes the player swim faster.
 * Acquired by swimming near dolphins.
 * Added Slow Falling status effect.
 * Causes the player to descend at a much slower rate, and not take any damage when hitting the ground.
 * This allows the player to jump further than normal.
 * If the player is sprinting while under the Slow Falling status effect, they will be able to jump across a gap of over 5$1⁄2$ blocks, compared to 4 with normal sprinting.
 * Crops will not get destroyed if the player lands on them with the Slow Falling status effect.
 * Higher levels do not change the rate of descent.


 * Tags
 * Items, blocks and functions can be "tagged" with an ID.
 * Block tags can be used when testing for blocks in the world.
 * Items tags can be used when testing for items in inventories.
 * Function tags can be used when calling functions using commands or advancements.
 * Functions tagged in  will run every tick at the beginning of the tick.
 * Functions tagged in  will run once after a (re)load.
 * Tags are created using data packs in,  , and.
 * When overriding a tag from a different data pack, you can choose to replace or append.
 * By default all tags append if another data pack created the tag.
 * Adding  to your tag definition will make the tag overwrite instead.
 * For example:
 * This will create a block tag called.
 * The json file contains a list of all blocks that should be "tagged".
 * This list can also contain other tags of the same type.
 * You can add for example  in a tag value list to reference another tag called.
 * Self referencing is not possible.
 * There are 24 vanilla tags for both items and blocks:,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  , and.
 * There are 5 extra vanilla tags for blocks:,  ,  ,  , and.
 * There is 1 extra vanilla tag for items:.
 * Separated some of the logic for blocks and fluids.
 * Current fluids:
 * The fluid at a location is currently dependent on the block at the location; currently there still are water and lava blocks.
 * Added two new fluid tags:  and.
 * This system is mostly internal; it cannot be directly interacted with yet.
 * Advancement item predicates now support item s.
 * Water physics
 * Water can now be placed in the following blocks: chests, trapped chests, stairs, slabs, fences, walls, iron bars, glass panes, ender chests, trapdoors, ladders, and signs.
 * Water can flow out of these blocks, but can not flow into them.
 * When full of water, they will count as water blocks for all gameplay (such as swimming).
 * Water will flow out of all faces of the block except for solid faces.
 * Removed the blocks  and.
 * All of the blocks that water can be placed in now have the block state.
 * Blocks such as bubble column or kelp will always count as a water source.
 * When water spreads and would later turn into a source block, it now immediately just places a source block.
 * Other
 * New  block tag for blocks that the player can spawn on.
 * There is now a distinction between scheduled "liquid ticks" and "block ticks".
 * Blocks such as bubble column or kelp will always count as a water source.
 * When water spreads and would later turn into a source block, it now immediately just places a source block.
 * Other
 * New  block tag for blocks that the player can spawn on.
 * There is now a distinction between scheduled "liquid ticks" and "block ticks".

Blocks

 * General
 * The upper limit of the block ID has disappeared.
 * Blocks which used to have no bottom texture (like repeaters, comparators, etc.) now have a bottom texture, not including redstone wire.
 * Blocks with a collision box now have matching bounding boxes.
 * Affected: anvils, cauldrons, hoppers, fences, iron bars, glass panes, filled end portal frames, vines, lily pads, stairs, brewing stands, and pistons.
 * Updated the collision box of anvils and hoppers.
 * Does not affect blocks with a collision box smaller than their model, such as soul sand and snow layers.


 * Beacon
 * Added new sounds.


 * Bed
 * Beds now require a block below it as a support. Previously this was only required when placing the bed and the block could be destroyed afterward without the bed being destroyed.
 * Changed message shown when failing to use a bed to say "You can sleep only at night and during thunderstorms."


 * Chests and trapped chests
 * They can be put directly next to their double variants instead of requiring one block between them.
 * Shift right-clicking a chest or trapped chest will only make it try to connect to the clicked chest or trapped chest if possible, else it’ll become a single chest or trapped chest.


 * Dispenser
 * Crafting no longer requires a fully repaired bow.


 * Fence gates
 * Placing them no longer requires a block below them.


 * Leaves
 * Naturally-generated leaves now survive at a distance of up to 6 blocks from logs, instead of 4.
 * The block state for leaves changed from a  and   Booleans to distance (ranging from 1 to 7) and a   Boolean.


 * Lever
 * Flicking a lever on now displays redstone particles.


 * Magma blocks
 * Now generate at the bottom of ocean ravines, creating downward bubble columns.


 * Monster eggs
 * They will now break instantly, no matter the tool.
 * When broken with Silk Touch, the non-infested counterpart of the block will drop.


 * Packed ice
 * Now can be crafted from 9 ice.


 * Pumpkins
 * Placing them no longer requires a block below them.


 * Shulker Boxes
 * Changed the purple shulker box to the new purple color.
 * Dyed shulker boxes can now be undyed in a cauldron.
 * a shulker box on a filled cauldron.
 * The water level in the cauldron will decrease by 1.


 * TNT
 * Removed the TNT  block state (explode on punch).


 * Vines
 * Multiple vines facing different directions, including on the bottom of blocks, can now be placed in the same block space.


 * Water
 * Has new colors.
 * Now only blocks 1 light per block, instead of 3.
 * This only affects newly placed water (for now).

Items

 * Carrot on a stick
 * Can now be crafted with a fishing rod that does not have full durability.


 * Elytra
 * Now require phantom membrane to be repaired instead of leather.


 * Fish
 * Item textures changed.


 * Fishing Rods
 * Now make sounds when reeled back in.


 * Iron horse armor
 * Changed the texture when equipped.


 * Map
 * Maps changed slightly in regards to which blocks are shown and which blocks are not.

Mobs

 * General
 * Zombies, skeletons, ocelots and wolves will naturally attack baby turtles, and zombies and zombie pigmen will seek out and trample turtle eggs.
 * Undead mobs will now sink in water.


 * Horse
 * The model has been changed to be more consistent with other mobs.
 * Some animations like opening its mouth when grazing have been removed from the model as well.


 * Husks
 * Husks now become a zombie instead of dying from drowning.


 * Parrots
 * They will now imitate phantoms and drowned.


 * Polar bears
 * They can now spawn on top of ice.


 * Skeleton horse
 * Are now rideable underwater.
 * Updated model to fix minor texture z-fighting, a glitch where textures overlap in an obtrusive and unintentional way.


 * Squid
 * Squids now shoot ink in response to being attacked.


 * Zombie horse
 * Updated model to fix extreme texture z-fighting, just like the skeleton horse.


 * Zombies
 * Zombies now become a drowned instead of dying from drowning.
 * Baby zombies now burn in sunlight.

Non-mob entities

 * General
 * Items and experience orbs will now float up in water.
 * Changed the name of several entities:


 * Fishing bobbers
 * Bobbers created by fishing rods have been given an entity ID,.
 * This ID can only be used for testing, summoning is not possible.


 * Item frames
 * Item frames can now be put on floors and ceilings.


 * Paintings
 * Paintings now use a namespaced ID for their motive.

World generation

 * General
 * Rewrote the world generation system.
 * In the Nether, vertical air cavities — stretching from bedrock level to as far as Y=35, and filled with lava from bedrock level to Y=10 – now occur in chains across the bottom of the Nether, often forming extensive ravines.
 * In newly generated chunks, you're less likely to find frozen oceans next to warm oceans, etc.


 * Biomes
 * The menu now shows the biome ID, rather than its name.
 * Biome names are now translatable.
 * Updated some biome names:


 * Customized world type
 * Removed.


 * Superflat customization
 * Preset strings no longer use a version number.


 * Trees
 * Large spruce trees now transform nearby grass blocks into podzol when they grow.


 * Witch Huts
 * Now generate with a mushroom in the flower pot.
 * Previously, the flower pot was completely empty.

Gameplay

 * Movement
 * Pressing the button in flowing water at ,   and   will now do normal jumps instead of  up.


 * Oxygen bar
 * The player's oxygen bar no longer regenerates instantly when they get out of water.


 * Sleep
 * Players in creative mode can now sleep even if monsters are nearby.


 * Visibility
 * Changed natural water visibility.
 * The longer a player stays underwater, the better they will be able to see.
 * Water is darker at lower depths.
 * The Water Breathing potion & Respiration enchantment no longer grant enhanced vision underwater.
 * Every ocean biome has a unique water color, and the swamp water color has been changed.
 * Visibility changes per biome.

Command format

 * General
 * Commands and functions are much faster and more efficient.
 * Most commands are now more case-sensitive. Lowercase is preferable wherever possible.
 * For example, this is no longer allowed:
 * The output signal of a command block used to be its "success count", but now is its "result".
 * Server commands (functions, console, rcon) now run from world spawn in the overworld, instead of at.
 * Errors during a command are now a nicer error message (with a tool tip for more info).
 * Added commands to the profiler.
 * Whitespaces are now allowed in entity selectors & blockstate arguments.
 * Blockstate files:
 * for blocks without block states changed to an empty string.
 * Item Frames now have  instead of   and   instead of.
 * Model references no longer start at the  folder, but instead at.


 * Command UI
 * A new prototype for the command UI.


 * Functions
 * Functions are now completely parsed and cached on load.
 * This means if a command is incorrect for any reason, the player will know about it on load.


 * NBT
 * The  NBT tag of items is now called , and no longer has number IDs in each compound.
 * and  nbt keys of item entities are no longer strings but are instead compounds with two longs named   and.
 * nbt keys of snowballs, eggs and ender pearls are no longer strings but are instead compounds with two longs named  and.
 * Changed all custom names (blocks, items, entities, block entities) from raw strings to JSON text components (which can be translated).
 * For example, is now  or


 * Specific Commands


 * Removed in favor of entity selectors.
 * Removed in favor of entity selectors.


 * Removed in favor of.
 * Removed in favor of.


 * The syntax of has changed.
 * {{cmd|clear [ ] [ ] [ (but doesn't change position).
 * {{cmd|execute at }} executes a command using the position, rotation, and dimension of the   (but doesn't change entity).
 * {{cmd|execute positioned }} executes a command using the position of.
 * {{cmd|execute positioned as }} executes a command using the position (x y z) of the   but nothing else.
 * {{cmd|execute align }} executes a command after aligning the current position to the block grid (rounding down),   is any combination of     and   (for example: , ,  and  ).
 * Examples:
 * using  will become
 * using  will become
 * {{cmd|execute facing }} executes a command as though the executor is facing.
 * {{cmd|execute facing entity (eyes{{!}}feet) }} executes a command as though the executor is facing the entity's eyes or feet.
 * {{cmd|execute rotated as }} executes a command as though the executor is rotated in the direction of the entity.
 * {{cmd|execute rotated }} will run the command as though the executor is rotated in the specified direction.
 * {{cmd|execute in (overworld{{!}}the_end{{!}}the_nether) }} executes a command as though the executor is in the specified dimension.
 * {{cmd|execute anchored (feet{{!}}eyes) }} will make the rest of this command use feet or eyes for ^ ^ ^ coordinates or facing commands.
 * Conditional sub-commands can let you prevent the command from running at all:
 * {{cmd|execute (if{{!}}unless) block  }} executes a command if (or unless)   matches.
 * {{cmd|execute (if{{!}}unless) blocks  (all{{!}}masked) }} executes a command if (or unless) the region between   and   matches.
 * {{cmd|execute (if{{!}}unless) entity }} executes a command if (or unless)   exists (returns 1 or more entities).
 * {{cmd|execute (if{{!}}unless) score  ( < {{!}} <= {{!}} = {{!}} >= {{!}} > ) 's score relates to  's score based on the chosen criterium.
 * {{cmd|execute (if{{!}}unless) score matches  }} executes a command if (or unless)  's score is in the   (ie ,  ).
 * As replacement for {{cmd|stats}}, a new sub-command  lets you store the result or success of a command somewhere:
 * is the result of a command, which replaces these old stats:,  ,  ,.
 * is how many times the command was successful. This is usually  or , but if the command split up (for example  ) then it may be more than  . This replaces.
 * The value will be stored when the full command has finished executing.
 * If a command isn't successful ( is  ),   will always be set to.
 * It will be made clear what the expected result of each command is.
 * {{cmd|execute store (result{{!}}success) score  }}
 * The value is stored into the scoreboard under  and.
 * The  must exist, but unlike with {{cmd|stats}} you don't need to set an initial value for.
 * {{cmd|execute store (result{{!}}success) block (byte{{!}}double{{!}}float{{!}}int{{!}}long{{!}}short)  }}
 * The value is stored in the nbt data at  of the block at   as a byte, double, float, int, long, or short.
 * {{cmd|execute store (result{{!}}success) entity (byte{{!}}double{{!}}float{{!}}int{{!}}long{{!}}short)  }}
 * The value is stored in the nbt data at  of one   entity as a byte, double, float, int, long, or short.
 * Like, {{cmd|execute store}} can't modify player nbt. Nbt inside the  key of items in the player's   or   is an exception and can be modified by {{cmd|execute store}}.
 * {{cmd|execute store (result{{!}}success) bossbar  (value{{!}}max) }}
 * The value is stored in the  or   setting of the boss bar with ID.
 * Data paths look like this:.
 * means foo's child called bar.
 * means element 0 of bar.
 * "quoted strings" may be used if a name of a key needs to be escaped.
 * Examples:
 * {{cmd|execute store success score @a foo run say hi}}
 * {{cmd|execute as @e[type=pig] at @s store success entity @s Saddle byte 1 if entity @p[distance=..5] }}
 * You can chain all sub-commands together.
 * After every sub-command you need to write another sub-command.
 * When you're done with chaining sub-commands,  lets you write the actual command to be executed.
 * is no longer allowed before the command.
 * {{cmd|execute as somebody at somebody run say hi}}
 * Example of old commands:
 * {{cmd|execute @e ~ ~ ~ detect ~ ~ ~ stone 0 say Stone!}} is now {{cmd|execute as @e at @s if block ~ ~ ~ stone run say Stone!}}
 * {{cmd|execute @e ~ ~ ~ detect ~ ~ ~ grass 0 summon pig}} is now {{cmd|execute at @e if block ~ ~ ~ grass_block run summon pig}}
 * {{cmd|execute @e ~ ~ ~ say Hello!}} is now {{cmd|execute as @e run say Hello!}}
 * {{cmd|execute @e ~ ~ ~ say Hello!}} is now {{cmd|execute as @e run say Hello!}}


 * {{cmd|experience}}
 * {{cmd|xp}} is now an alias for {{cmd|experience}}.
 * Split up into 3 different subcommands:
 * {{cmd|experience add [points{{!}}levels]}}
 * Adds  of either points or levels to the target   (defaults to points).
 * Adding points can cause players to level up, as usual.
 * Negative numbers are supported, to subtract points instead.
 * Subtracting points can cause players to level down.
 * {{cmd|experience set [points{{!}}levels]}}
 * Sets  of either points or levels on the target   (defaults to points).
 * You cannot set more points than their current level allows.
 * When changing levels, the points will stay at the same percentage as the previous level.
 * {{cmd|experience query (points{{!}}levels)}}
 * Returns either the number of points or levels on the given.


 * {{cmd|fill}}
 * The syntax of {{cmd|fill}} has been changed.
 * {{cmd|fill    arguments.
 * This has been moved into {{cmd|execute}}.
 * {{cmd|function foo if @e}} is now {{cmd|execute if entity @e run function foo}}


 * {{cmd|gamerule}}
 * {{cmd|gamerule}} no longer accepts unknown rules ("custom gamerules").
 * You can use functions or scoreboards as replacements, with no loss of functionality.
 * Existing custom gamerules will just not be accessible. Only built-in rules will be available.
 * Values to {{cmd|gamerule}} are now type checked (giving a string if it wants an int is a very obvious error).
 * Removed the  gamerule in favor of functions tagged in.


 * {{cmd|give}}
 * The syntax of {{cmd|give}} has changed.
 * {{cmd|give [ ] [  is now mandatory.


 * {{cmd|list}}
 * Can now be used in singleplayer.


 * {{cmd|locate}}
 * The y-coordinate is now returned as  instead of.
 * The  of the command, used by {{cmd|execute store}}, will be the absolute distance to the structure.
 * Now accepts different structure names for all structures previously grouped under : ,  ,  , and.


 * {{cmd|op}}
 * Now allows target selectors besides names.


 * {{cmd|particle}}
 * The  argument has been removed, instead the parameters for particles like   can be specified right after the   argument using the new block argument.
 * {{cmd|particle block polished_granite ~ ~ ~ 0 0 0 0 1 }}
 * {{cmd|particle dust 1 1 1 1 ~ ~ ~ 0 0 0 0 1 }}
 * are, in order, the three RGB color values (0-1) and the size of the particle.
 * {{cmd|particle }} is now a valid shortcut. ,  , and   will default to.
 * Particle names have been changed.
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed
 * -> removed


 * {{cmd|playsound}}
 * Will {{key|Tab}} auto-complete custom sound events.


 * {{cmd|replaceitem}}
 * The syntax of {{cmd|replaceitem}} has changed.
 * {{cmd|replaceitem block  [ ] [  argument no longer requires
 * For example,  now is


 * {{cmd|scoreboard}}
 * {{cmd|scoreboard}} had  removed from its commands in favor of the   argument in entity selectors.
 * {{cmd|scoreboard players tag}} and {{cmd|scoreboard teams}} removed. Replaced by {{cmd|tag}} and {{cmd|team}} respectively.
 * {{cmd|scoreboard players test}} removed in favor of {{cmd|execute (if{{!}}unless) score}}, entity selectors and {{cmd|scoreboard players get }}


 * {{cmd|seed}}
 * The output can now be copied.


 * {{cmd|setblock}}
 * The syntax of {{cmd|setblock}} has changed.
 * {{cmd|setblock [  and , which covers all the old stat types.


 * {{cmd|stopsound}}
 * can now be used instead of  to stop all sounds with a certain name, across all sources.


 * {{cmd|tag}}
 * Replaces {{cmd|scoreboard players tag}}.
 * Keeps the same syntax.
 * {{cmd|tag add }} to add  to.
 * {{cmd|tag remove }} to remove  from.
 * {{cmd|tag list}} to list all tags on.


 * {{cmd|team}}
 * Replaces {{cmd|scoreboard teams}}.
 * Keeps the same syntax.
 * {{cmd|team add [ ]}}
 * {{cmd|team empty }}
 * {{cmd|team join [ ]}}
 * {{cmd|team leave [ ]}}
 * {{cmd|team list [ ]}}
 * {{cmd|team option  }}
 * Teams can now have a prefix and a suffix.
 * {{command|team|option| |prefix| }}
 * {{command|team|option| |suffix| }}


 * {{cmd|testfor}}, {{cmd|testforblock}} and {{cmd|testforblocks}}
 * Removed. Now part of {{cmd|execute}}.


 * {{cmd|toggledownfall}}
 * Removed. It was always used to stop the rain, but rain usually quickly returned.
 * Use {{cmd|weather}}.


 * {{cmd|tp}} and {{cmd|teleport}}
 * {{cmd|tp}} is now an alias of {{cmd|teleport}} (much like {{cmd|w}}, {{cmd|msg}} and {{cmd|tell}}).
 * {{cmd|teleport}} has been simplified a bit, to avoid ambiguity.
 * {{cmd|teleport }} doesn't allow rotation or facing, will teleport you to the entity.
 * {{cmd|teleport }} doesn't allow rotation or facing, will teleport you to the position.
 * {{cmd|teleport }} doesn't allow rotation or facing, will teleport victim to entity.
 * {{cmd|teleport [yRot xRot]}} will teleport victim to that position with optional rotation.
 * {{cmd|teleport facing [xFacing yFacing zFacing]}} will teleport victim to that position facing another position.
 * {{cmd|teleport facing entity  [feet{{!}}eyes]}} will teleport victim to that position facing an entity's feet or eyes (default feet).
 * Teleporting to an entity in another dimension is now allowed.


 * {{cmd|trigger}}
 * {{cmd|trigger }} is a new syntax as a shortcut for {{cmd|trigger add 1}}.
 * {{cmd|weather}}
 * If you don't specify a time, it now defaults to 5 minutes (previously random).


 * Argument Types


 * Target selectors
 * More error handling has been introduced.
 * Things like,  ,   are not allowed.
 * Arguments may now be quoted.
 * There are no longer separate "min" and "max" values; instead ranges are supported.
 * is level 10.
 * is level 10, 11 or 12.
 * is anything level 5 or above.
 * is anything level 15 or below.
 * The arcane shorthand names have been renamed.
 * or  ->
 * or  ->
 * or  ->
 * or  ->
 * ,,  ,  ,   and   are now doubles and allow values like
 * and  are no longer center-corrected.
 * This means  no longer equates to.
 * (previously ) no longer allows numerical or shorthand IDs.
 * (previously ) no longer allows negative values.
 * Use  instead.
 * The  argument now supports spaces (as long as it's quoted).
 * Multiple of the same argument in target selectors is now possible.
 * matches someone with,   and not.
 * matches something that isn't a cow and isn't a chicken.
 * isn't allowed, because something cannot both be a cow and chicken.
 * You can specify the sorting.
 * is the old default, sorting by distance (default for )
 * is the reverse of that (previously you'd use  for this)
 * for random sorting (default for )
 * is a new option to not sort the result (default for,  )
 * Specifying scores now looks like
 * You can test for advancements with
 * for "they completed the advancement",  for "they have not completed the advancement"
 * Alternatively, pass a block of specific criteria to test for (again,  or  )
 * for "they completed the advancement",  for "they have not completed the advancement"
 * Alternatively, pass a block of specific criteria to test for (again,  or  )


 * Blocks
 * Wherever a, optionally   and optionally   was required, it's now a single   argument that looks like this:
 * ID is required (though just as before, if namespace isn't set it defaults to ).
 * States are inside, comma-separated and must be properties/values supported by the blocks. They are optional.
 * is a syntax error, because  doesn't have.
 * is a syntax error, because 's   is a number between 0 and 15.
 * NBT tag is inside {}, and works just like you'd expect. It's optional.
 * In the context of "conditions"/testing for blocks, only the states you provided will be tested.
 * If you test, it only checks power but ignores other states such as.
 * In the context of setting blocks, any states you provided will be set but anything missed out will default depending on the block.
 * If you set, it will set   to 15 but   will be a default value (in this case, set to  ).
 * There is no such thing as block data value in 1.13. It's either a different block, or a state.
 * If you test, it only checks power but ignores other states such as.
 * In the context of setting blocks, any states you provided will be set but anything missed out will default depending on the block.
 * If you set, it will set   to 15 but   will be a default value (in this case, set to  ).
 * There is no such thing as block data value in 1.13. It's either a different block, or a state.


 * Items
 * Wherever an, optionally   and optionally   was required, it's now a single   argument that looks like this:
 * ID is required (though just as before, if namespace isn't set it defaults to ).
 * NBT tag is inside {}, and works just like you'd expect. It's optional.
 * There is no such thing as item data value or item damage value in 1.13.
 * Damage, where applicable, is a property in nbt.
 * Any other information is either a separate item or a property in nbt.
 * Damage, where applicable, is a property in nbt.
 * Any other information is either a separate item or a property in nbt.

General

 * The "flattening"
 * Numeric block metadata completely phased out in favor of block states.
 * Split, merged, created, deleted, and renamed a lot of blocks, blockstates and items.
 * Blocks and items previously differing because of damage value have gotten their own id, for example  instead of
 * Damage has been moved to the  tag and is only used by tools and armor; maps use a   tag.
 * The damage predicate has been reversed - 0.6 now means 60% durability remaining, not 60% broken
 * Files and commands no longer use  or.
 * Structures do not run an upgrade path for this.
 * To update your structures, load them all in 1.12, then update to 1.13 and save all structures again.


 * In-game menu screen
 * New title screen background, featuring many of the structures, blocks, and mobs that were added in the Update Aquatic.


 * Advancements
 * Advancement descriptions now have colors:
 * Normal and goal advancements have green descriptions.
 * Challenge advancements have purple descriptions.


 * Controls
 * The name of keybindings now describes the actual key (e.g. 'LBUTTON' -> 'Left Button', 'BACKSLASH' -> '\')


 * Creative Inventory
 * Because of The "flattening", certain blocks and items have been moved around in their respective groups, for example the Purpur block is now after Obsidian.
 * Mushroom Blocks, farmland and grass path are added to the inventory under the Decoration Blocks group. Additionally, blank firework rockets are added to the Miscellaneous group.


 * Credits
 * Updated the credits list to include all of the Mojang staff.


 * Debug screen
 * '''Left side:
 * Added "Looking at liquid" row. Displays the targeted fluid's coordinates.
 * "Looking at" row has been renamed "Looking at block" and now targets through liquids.
 * '''Right side:
 * "Targeted Block" informations now targets through fluids.
 * "Targeted Block" now displays information for blocks up to 16 blocks away.
 * Added "Targeted Entity". Displays information for entities up to 16 blocks away.


 * Fonts
 * Many non-Latin alphabet characters have been given their own "textured" font. However, some characters (such as kanji and script) still use the unicode font.
 * Fonts are now saved as TrueType font files.


 * Music
 * Three brand new pieces of underwater music by C418 have been added:
 * Shuniji, Dragon Fish and Axolotl.
 * Their ID for commands is.


 * Options
 * Removed 3D Anaglyph completely.
 * Removed "Force Unicode Font" option.


 * Particles
 * Optimized particle rendering slightly.
 * Dripping
 * Drip particles are now generated by waterlogged blocks where appropriate.
 * Drip particles now snap to the hitbox of the block they appear on.


 * Recipes
 * Custom recipes can now be loaded from data packs in
 * Added a recipe book for the furnace.
 * Furnace recipes have been moved to JSON files.
 * They use.
 * is used to determine the time it should take to smelt an item in the furnace.
 * is used to determine the amount of experience a player should get when picking the resulting item out of the furnace manually.
 * Fuel is not included and is still hardcoded.
 * "Unlocked recipe" toasts now show an icon in the top left to specify whether the unlocked recipe is a crafting or smelting recipe.


 * Resource packs
 * Updated format number to.
 * The default resource pack can now be moved up and down on the resource pack selection screen.
 * The resource pack folder  got renamed to.
 * The resource pack folder  got renamed to.


 * Statistics
 * Statistics are being updated.
 * is now.
 * is now.
 * Tooltips
 * Added (and fixed) colored tooltips for certains items. Items with a rarity value will have their hotbar tooltips, which are displayed when scrolling over them in the hotbar, displayed as their respective colors when highlighted, rather than just being white.


 * Other
 * Game library updated to LWJGL 3.
 * Updated LWJGL from version 3.1.2 to 3.1.6.
 * Loading or creating a world shows the percentages of the loading stages.
 * now shows as a loading stage.
 * Crash reports now list what data packs are enabled.
 * Data generators are now exposed, you can get a dump of all blocks/items/commands/etc from the game without opening it up.
 * Changed translation files from  to.
 * Now supports newlines.
 * Optimized cloud rendering.
 * Optimized fog rendering.
 * Optimized world spawn position–finding code.
 * Removed  from exploration map loot table function.
 * Upgrade path optics code is now in a separate library, datafixerupper.

Planned changes

 * World generation will become data-driven, using json files, allowing for custom structures.

Unconfirmed features

 * The ability to change biome dependent colors (such as foliage, water, and the sky) without needing mods.
 * Recipe book design might be changed.
 * , and  might be replaced by,  and.
 * ,, and  might be replaced by other commands.

Trivia

 * 1.13pre-6 was released exactly one month after the first one.
 * With a total of 7 pre-releases released so far, 1.13 is tied with 1.8.2 and 1.12 for the most amount of pre-releases for a single update.
 * With 42 snapshots, 1.13 is third in the most snapshots.