Watcher

Watchers are Skeletons found in The End. They are Level 55 and have what appears to be a Summoning Eye on their head. They are often found near the middle and back areas.

Description
The Watcher wields a bow (presumably the End Stone Bow) and will alternate between shooting normal arrows and Level 40 Endermites.

As players often ignore Watchers, Endermites and Obsidian Defenders in favor of killing Zealots for Summoning Eyes, the spawned Endermites, Watchers and Obsidian defenders often accumulate in large amounts.