Unused Features

Giant
Giants are an unused mob added in Indev. They appear to be a giant zombie. Giants currently have no AI and they cannot spawn naturally because the game requires the light level to be both greater than 11 and less than 8. They can be summoned using the /summon giant command.

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. When it was originally added in snapshots of 1.8, it spawned as a rare type of rabbit, but it was removed before the final release.

The Killer Bunny can only be spawned with the /summon rabbit ~ ~ ~ {RabbitType:99} command.

Illusioner
The Illusioner is an unused Illager that was added in 1.12. They will attack players, villagers, and iron golems within a 12 blocks range. It will attack with its spells, and with its bow.

The illusioner has two spells: a spell that blinds its opponent, and a spell that summons duplicates and makes the illusioner invisible.

The illusioner has a face that is just like the face of a vindicator.

Illusioners can only be spawned with the /summon illusion_illager command.

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 was 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. During an interview about villagers, Jeb offered a possible explanation: "We did some experiments with thoughts bubbles, but it didn't look good. So in the end, after I’d been lead on Minecraft for a year, we just decided to add an interface instead."