Ender Golem

Ender Golems are like endermen, even the same height except that they hold a dead enderman,and chase you around using it like a hammer, and the Ender golems are much heavier.

Attacking Style
They throw you into the air about 10 to 16 blocks high, and 25 to 40 blocks away, thus causing fall damage. A painful death for anyone with less than 5 hearts. They also can shoot ender- bolts, which does severe damage too. (4.5 hearts on easy, 6 hearts on normal, and 9.9995 on hard.)

Strategies to take it down
Due to its melee attack of throwing, ranged attack of shooting bolts, and a health of 60 hearts, I recommend using an enchanted bow with flame V, and power V, but not punch cuz that would make it further and therefore harder to target. I also recommend diamond armor just in case the bolts hit you. And enchant it with Feather falling because its very long arms can reach you from 12 blocks away.