Java Edition unused features

Since the beginning of Minecraft's development, there have been a number of features added to the game that have no actual use in Survival or in Creative. Some of these features are leftover from removed features, or simply placeholders for new features.

Note that this page only documents unused features that are currently in the game. See removed features for features previously in the game that are no longer available.

Seamless slabs


All double slabs above data value 8 have the seamless tag. This displays the top texture of the slab on all 6 sides. This is only visible on four slabs: stone, sandstone, red sandstone and quartz. All other seamless slabs look identical to their normal counterparts. Breaking seamless slabs will yield two of their respective slabs, which will create normal double slabs if stacked. Seamless slabs can be obtained in versions 1.7.10 and below. They can be obtained by using (Seamless Stone)  (Seamless Sandstone). They cannot be obtained in item form in versions 1.8 and above, but can still exist as blocks.

Bark blocks


Wood blocks with data values 12 through 15 have the bark texture on all 6 sides. These are not found naturally and cannot be crafted, though they are obtainable with commands. When obtained in the inventory and placed, they will act like a normal wood block, placing with their axis corresponding to the face of the block clicked. Like Seamless slabs, these blocks can be obtained at versions 1.7.10- using /give command. They can be placed, but just like as normal (depending on the wood) log.

Stone wooden slabs
Before unique slabs corresponding to different wooden planks species were added, oak wooden slabs were treated like other stone-type slabs. They required a pickaxe to break, had a blast resistance greater than normal planks, and had stone sounds. They are still obtainable in worlds which had them in it previously. They are tagged as Wooden Slab, reflecting on the fact oak was the only wood species in plank form. In the Pocket Edition until Alpha 0.11.0, they are tagged as Fake Wood Slab, and will drop normal oak wood slabs when broken. This slab is still obtainable with commands, with damage value 2 and block type wood_old. It has a missing texture in the inventory.

Giant


Giants are an unused mob added in Classic SURVIVAL TEST. They appear to be a giant zombie. Giants have no AI and are only intended to spawn when the light level is both greater than 11 and less than 8. They can be summoned using the command.

The Killer Bunny


The killer bunny is a variant of the rabbit that is hostile to all players and dogs. Its fur is pure white with blood-red eyes that are horizontal, compared to a normal rabbit's vertical eyes.

On peaceful difficulty, the killer bunny will not despawn, despite its hostile nature. It will still attack wolves and pet dogs. It was originally a type of rabbit in 1.8 but was later removed.

The Killer Bunny can only be spawned with the command.

Zombie Horse
Zombie Horses are a variant of horses that were added in 1.6, along with normal and skeleton horses. In 1.9 skeleton horses were made spawnable in survival, but zombie horses remain unused.

Zombie horses can be spawned with the /summon command, or with spawn eggs

Illusioner
Illusioners are unused Illager that were added in 1.12.

Illusioners can only be spawned with  command.

Particles
These particles are unused and can only be spawned using.


 * depthsuspend
 * Was previously used by The Void to decrease one's view the further down they venture.
 * In 1.8 (14w34c) it was changed so that the void no longer emits these. The reason was for better performance.
 * footstep
 * Is an 8x8 texture which spawns below your feet. Cannot be obtained except with command blocks.
 * cloud
 * take

Potions
The uncraftable potion is a potion added in the 1.9 snapshot 15w44b with no effect that is unobtainable in survival. It is also available in splash potion and lingering potion forms, as well as for tipped arrows. Its use is unknown.

It can be obtained using the following command:.

There are also potions that cannot be brewed, and give you status effects not intended to be received by potions; e.g. Wither, Nausea. Again, these can only be obtained through custom potions.

Status effects
Various status effects remain unused in the game. They can be obtained using or potion NBT data, but have no way of being obtained other than that.

Bad Luck
Bad Luck reduces chances of high-quality loot.

Blindness
Blindness is a status effect which creates thick black fog around the player and prevents them from sprinting. As of snapshot 17w16a for 1.12, this effect can be obtained from an illusioner, though those mobs are also unused.

Health Boost
During the 1.6 snapshots, the health boost status effect was added. It boosted the player's hearts for a temporary time. It could be obtained from eating a golden apple.

In the next main snapshot, golden apples give the player absorption instead of health boost, but the effect was still left in the game.

Strangely in 1.9, the developers gave the Health Boost effect a new texture from its original golden heart texture, despite the fact that it is still not in use.

Saturation
Saturation is a status effect added in the 1.6.1 pre-release. It causes the hunger bar to refill by each tick.

Audio loops
Loops were unused sounds, found in the game files, and were possibly meant for when the player is in a specific type of location (i.e., in caves, woods, the ocean and beside a waterfall).

They were found in, and could be converted to reveal four loops, of birds chirping, cave chimes, ocean and waterfall noises.

Others
However, the "Breath" sound is still usable by running "/playsound random.breath master @p" in chat/command blocks.

Textures
Various textures located in minecraft.jar remain unused.

Angry villager head


In the particles sheet, there is an angry villager head which remains unused.

Paeonia


Paeonias are unimplemented flowers that were replaced by the two-block-tall peonies.

There was only one screenshot of the block released by Jeb. Its texture file can still be found; it is named flower_paeonia.png.

Purple arrow
Purple arrows were shot by skeletons in Survival Test and acted the same as regular arrows, and used a texture on the same sheet as the normal arrows, but the texture is not currently in use.

In 1.9, a new texture was added for arrows, causing the original arrow texture including the purple arrows to be entirely unused.



Ruby


On May 21, 2012, Jeb released a screenshot of himself testing the trading system. At this time, what would become emerald ore in 1.3.1 was ruby ore. The previous ruby texture remains in the ruby.png file. It is unknown if the texture will ever be used. Dinnerbone stated in a forum post that they went with emeralds instead of rubies at the last minute because he is color-blind and he had a hard time spotting the difference between ruby ore and redstone ore. The names "Ruby Ore" and "Ruby" are still in the .lang files.

Villager speech bubble


The villager speech bubble is an image that got added along with the villager.png file in the jar when the trading system was added. It showed a trade, where raw chicken could be sold to villagers for another raw chicken. Both raw chickens have the old texture. Its use is unknown.

In the 1.9 Resource Pack, part of the bubble is overlayed with the selection arrows, meaning the texture has no purpose.