Shulker

The Shulker is a mob that was added in 1.9. It dwells in the End City Dungeons. It hides in its shell to blend in with Surrounding Purpur Blocks.

Spawn
The Shulker will spawn in an End City Dungeon, which are located on the outer islands of the End.

Attack Strategy
The Shulker will hide in it she'll. When it has you in its sites It comes out. It will shoot projectiles that only move along the X, Y, and Z axises, but they can change direction, similar to a heat seeking missile.