3 adds that cast Eerie Blast which is a crushing dd throw
Keys to the fight:
1) This is a multi-tank fight due to his mem-wipe.
2) Position tanks somewhere so they won't get thrown far (under a ceiling, in a nook, etc)
3) Position healers on a different vertical axis level to avoid his AE.
4) Keep his adds mezzed until he's dead.
5) Keep both tanks healed up to be ready for the agro exchange.
Follow these and enjoy the toughest fight in GoAA!
More information is needed.