The ninja of the end: "Endone"

This mob is a very deadly enemy to encounter. Only found in the end in a  purpur/obsidian arena, it's a mob that looks similar to the silent realm guardian that hovers above the ground in the Legend of Zelda skyward sword and would respawn naturally. It's name is "Endone". This mob does not move around normally, but instead will hover in the center of the arena and will turn only it's head to look at the player, and will fight when provoked.

Endone is a boss battle. The boss is strong and clever and will stay out of players reach. He would have three attacks: a normal sword swipe a sword beam, and a charged rush attack. The sword swipe and sword beam can be blocked by a shield, but blocking the sword beam will cause "Endone" to teleport behind the player to swipe at him. The charged rush attack is an uncommon tactic "Endone" will use if he is unable to hit you very often. He will perform a small animatic where he looks to be preparing an attack, and will fly at you a very fast speed to deliver a powerful chop that goes right through shields. The only way to stop this attack is to hit him with your sword at the right moment. This mob will have the ability to move through blocks, so building a structure to cheese the fight would be impossible. Also it will teleport away when fired at from a bow.

A possible drop for this mob is its sword, allowing you to fire sword beams, but it's not possible to enchant it.