Okay my guild starting it first 25man malygos fight tonight and they asked me do some research on how do as a DK so if anyone has any good info to use please let me know
as a DK.. they might ask you to death grip those orbs every now and then. Besides that, use IBF and AMS when there's the vortex. And since you're a melee class, you might also have to go on those little flying things (forgot what they're called, sorry) in phase 2 when the 1st mobs die and then go attack the other mobs.