mistmoore 2.0 - Tyrian the Tormented  

He spawns in the locked crypt in the Graveyard.

The key to unlock the door drops from Trueborn Lord Rygrim, who spawns on the bottom floor of the castle in a room containing five mummies. The mummy in the center of the room standing right on top of the coffin there is the PH for the named. There is nothing special about the named - it hits for 950 quads and drops a piece of loot in addition to the key.

Key dropped on our first kill of the named. It is not no-rent, so it can be used over and over again, just as long as Tyrian (the untargetable version) is up in the crypt. When the crypt door is opened with the key, Tyrian becomes targetable and attacks whoever is in sight. The pathing is horrible in the graveyard, so we found it easier to clear the mobs just before the gate and pull Tyrian there. Tyrian himself has a fairly large amount of hp, partially mitigates slow, rampages, and is also undead.

Adds are triggered by its loss of health, so if you need to res up, you can have all damage stop on Tyrian and hold it there until ready again. The adds are mesable, fully slowable, and undead.