Shulker

The Shulker is an upcoming hostile mob in added 1.9. It dwells in the End City Dungeons. It hides in its shell to blend in with surrounding Purpur Blocks. The Shulker is a mixed word of Shell lurker

Spawning
Shulkers spawn in an End city dungeon, which are located on the outer islands of the End.

Appearance
The shell of the mob looks like a purple block. It can also appear on walls.

Behavior
When attacking, shulkers open up and shoot bullets which only move along the X, Y, or Z axis. The projectiles can be knocked away by attacking them. If the player gets hit by one, it causes of damage and provides the levitation status effect.

However, by using commands, they can be made to be part of a team to attack other teams and can be used as defense mobs.

Shulkers sometimes teleport when attacked. They also teleport when spawned on top of a piston, or when pushed into a block by a piston. They seem to teleport with a range of about 8 blocks.

Trivia

 * The name shulker is short for "Shell Lurker".
 * The block that shulkers hide in is not usable or obtainable.