Ok here I dispell any rumors YOU GET A FACTION HIT for killing him. It's not as dramatic as the Lucan one in FP but it was enough to make the ogres cry in their beer. Dread guards, dark beginners, and of course indigos will hate you for killing Kirak.
As for Kirak himself, he is lvl 55 SK (bit of a HT to the puller) and doesn't hit for much (180 was the highest reported) but he has an insane regen rate and a bucket of HP to boot. 2 groups of 48-54 took him out in about 5 minutes with DOT's and plain old slashing. Bring the melees and bring the shammys.
Rietveld Pureheart
52nd cavalier of Marr who is one step closer to the epic
Emerald Flame, server Seventh Hammer