Java Edition 20w15a

20w15a is the eleventh snapshot for Java Edition 1.16, released on April 8, 2020, which adds a new Nether biome, new music tracks, new blocks, and other changes and fixes.

Blocks

 * Blackstone
 * Generates in basalt deltas.
 * Can be used in place of cobblestone to craft furnaces and stone tools.
 * Has a slab, stair, and wall variant.


 * Blackstone Slab, Blackstone Stairs, Blackstone Wall
 * Decorative blocks crafted from blackstone.


 * Chiseled Nether Bricks
 * New variant of Nether bricks.
 * Crafted from 2 Nether brick slabs.


 * Chiseled Polished Blackstone
 * Decorative block crafted from polished blackstone.


 * Cracked Nether Bricks
 * New variant of Nether bricks.
 * Obtained by smelting Nether bricks in a furnace.


 * Cracked Polished Blackstone Bricks
 * Decorative blocks crafted from polished blackstone.


 * Gilded Blackstone
 * Has a chance of dropping 2–5 gold nuggets (increased with Fortune), or it will drop itself instead.
 * Currently only available via the creative inventory or by using commands.


 * Polished Blackstone
 * Crafted with 4 blackstone.
 * Has a chiseled, slab, stair, and wall variant.
 * Can be crafted into buttons and pressure plates.


 * Polished Blackstone Bricks
 * Crafted with 4 polished blackstone
 * Has a cracked, slab, stair, and wall variant.


 * Polished Blackstone Brick Slab, Polished Blackstone Brick Stairs, Polished Blackstone Brick Wall
 * Decorative blocks crafted from polished blackstone bricks.


 * Polished Blackstone Button and Polished Blackstone Pressure Plate
 * Redstone blocks crafted from polished blackstone.
 * Work like their stone counterparts.


 * Polished Blackstone Slab, Polished Blackstone Stairs, and Polished Blackstone Wall
 * Decorative blocks crafted from polished blackstone.


 * Quartz Bricks
 * A decorative block crafted from 4 blocks of quartz.


 * Soul Campfire
 * Have a blue flame instead of orange.
 * Has a light level of 10.
 * Does the same amount of damage as a regular campfire.
 * Crafted with soul sand or soul soil instead of coal.
 * Piglins are repelled by soul campfires.

Items

 * Piglin Banner Pattern
 * New pattern for banners, the Piglin.
 * Used in the loom to apply the Piglin pattern to the banner.
 * Currently unobtainable in Survival Mode

World Generation

 * Biomes
 * Basalt Deltas
 * A volcanic biome in the Nether. Fog effects have flakes of volcanic ash.
 * Filled with pillars of basalt and large areas of blackstone.
 * Ghasts, magma cubes, and striders spawn in this biome.

General

 * Accessibility
 * Chat line spacing can now be adjusted.
 * A chat delay can be set between 0 (default) and 6 seconds.


 * Music
 * Added 3 new soundtracks to the Nether, composed by Lena Raine: "Rubedo", "Chrysopoeia" and "So Below".
 * "Rubedo" plays in the nether wastes biome.
 * "Chrysopoeia" plays in the crimson forest biome.
 * "So Below" plays in the soul sand valley and basalt deltas biomes.


 * Sound
 * Added ambient sounds for the basalt deltas.


 * Tags
 * Added block tag.
 * Contains campfires and soul campfires.
 * Bees, parrots, and turtles will view blocks in this tag as dealing fire damage and pathfind accordingly.
 * Campfires use this tag to determine if they are lit or not.
 * Flint and steel uses this tag to determine if it can light campfires.
 * Added block tag.
 * Contains container blocks (chests, trapped chests, ender chests, barrels, the  block tag) and gold blocks (blocks of gold, gilded blackstone, and the   block tag).
 * Piglins will become hostile towards a player that destroys a block in this tag.
 * Added item tag.
 * Contains cobblestone and blackstone.
 * Items in this tag can be used to craft furnaces and will unlock the recipe in the recipe book.
 * Added item tag.
 * Contains cobblestone and blackstone.
 * Items in this tag can be used to craft stone tools and will unlock the recipes in the recipe book.
 * Added item tag.
 * Parallels the block tag.
 * Contains soul sand and soul soil.
 * Items in this tag can be used to craft soul fire torches and soul campfires and will unlock the recipes in the recipe book.

Blocks

 * Dispensers
 * Can now saddle pigs, striders, and tamed horses, donkeys and mules.
 * Can now put horse armor on tamed horses.
 * Can now put carpets on tamed llamas.
 * Can now put chests on tamed llamas, donkeys, and mules.
 * Can now shear mooshrooms and snow golems.


 * Furnaces
 * Can now be crafted with blackstone.


 * Soul fire torches
 * Can now also be crafted with soul sand.


 * Walls
 * Now connects to the bottom and sides of glass panes and iron bars.
 * Now connects to the bottom of sea pickles.

Items

 * Stone axes, hoes, pickaxes, shovels, and swords
 * Can now be crafted with blackstone.


 * Hoes
 * Are now the default tool for mining leaves.
 * Shears are still used for collecting leaf blocks.


 * Fungi, nether sprouts, roots, nether wart, nether wart blocks, warped wart blocks, twisting vines, and weeping vines
 * Can now be composted.

Mobs

 * General
 * Mobs now avoid walking on magma blocks and lit campfires.


 * Hoglins
 * Baby hoglins no longer drop loot (but still drop experience).


 * Magma cubes
 * Spawn commonly in basalt deltas.


 * Piglins
 * Now avoid soul campfires.
 * Now become hostile towards any player that breaks a chest, trapped chest, ender chest, barrel, gold ore, nether gold ore, gilded blackstone, or a gold block.


 * Striders
 * Now turn blueish-purple outside of lava.
 * When outside lava, their facial expression becomes a more prominent frown.
 * Can now only spawn if the block above the lava is air.
 * Baby striders ride on top of bigger striders.


 * Zoglins
 * Are now undead.

General

 * Tags
 * Added polished blackstone, and (where applicable) blackstone blocks and items to the block and item tags.
 * Added soul campfires to the block tag.
 * Added the  block tag and removed lanterns and soul fire lanterns from the  block tag.


 * Textures


 * Removed an unused fin from the strider texture.

Video
Video made by slicedlime:

Trivia

 * The word "Rubedo" is Latin for "redness", possibly associated with the red-colored environment of the Nether.
 * The word "Chrysopoeia" is an alchemy term that describes the transmutation from a given object into gold.