Dippy

This adorable little bastard is harder than it seems. He has only one ability: Peck.

Does well over 400k on plate, and has a 1.0 sec cast-time, (or 0.5 not really sure) and if he casts this on you, you're dead. Simple as that.

He also has some problem getting his footing, any direct hits on him will make him slip and fall for about 1 second. Only DIRECT hits FROM YOU make this happen, dots don't count, neither do AoEs, or pet attacks.

Every time he is hit by any direct hit, he will fall down and be knocked back a little bit, if you are a ranged class, just spam any instant-cast ability you have and play it safe.

FOR MELEE CLASSES, THIS PART IS VERY IMPORTANT: While he will fall down every time he is knocked down, he will also be knocked back a little bit, and eventually he will hit one of the walls, when this happens HE WILL NOT FALL AGAIN AND WILL ONE SHOT YOU. To counter this, once you have him against a wall, run away as fast as you can, he will chase you, and once you have him far enough from the wall, continue your relentless assault. You must not stop hitting him at any moment, his peck is deadly.

For all classes: Do note that he is immune to pretty much all forms of CC and snares, and if you use a pet, he will ignore them and focus on you (confirmed only as a DK, used army of the dead, and he ignored their taunts and focused on me)

aw, what a cute little pen-- OH GOD MY EYES!

Killed him on my rogue by simply standing still. He will move himself back in range and won't begin casting peck until you're hitting him again, trivialising the whole fight.

EDIT: Still works in Legion. Just stand still and swing away