We beat this fool last night. Fighting him is almost unbelievably annoying.
First, you have to clear your fomor hate to be able to fight him efficiently, which isn't hard but takes a bit of time. Then, you have to find the correct pop spot, which took us almost an hour. After that, you have to fight him in an environment where one mistarget is certain death. And then, he summons annoying little friends that love to beat on mages, plus he warps around like crazy and does all those annoying ghost TP moves, plus he LOVES to use Sleep (so bring your hi-potions and poison potions).
We beat him, but the tank and all three support died. Our galka MNK 2hrd him and then tanked (chugging hi-potions) while our SAM 2hrd him with 26hp remaining. Epic battle, but this guy definitely wins the 'more annoying than the Promy-Holla Boss' award. :)