He is NOT soloable as lvl 61 Warlock, do NOT even try. He hits me for something like 500 - 600 fast like hell and my Felguard got it's ass spanked in NO TIME. This boss is in fact hard, at least as a Warlock. he hits for more than 3 - 4 of what hes guards do added together.
Stupidest thing ive ever heard. The dude is a piece of cake. His adds can easily be taken out one by one and because of the confined space hes in with the citadel and mountains sorrounding him this is the best place ive ever experienced for fear+dot. Curses and repeating fear takes him out pretty fast, your'e right that he hits hard tho, but he shouldnt be able to get close enough to u to do that...
lvl 62 lock btw