run demonic with the +leech in meta talent. I think i had the argus ring lego, and KJ trinket when i did it, so far from optimal.
Like
Fyff
said its the standard Demonic spec.
in phase 1 - chaos nova every time he puts you in the ice cage and felrush out, you can also fel rush over the middle lasers. every time you chaos nova your eyebeam will be up. and the demonic meta proc should be up long enough to more than top you off on HP. when the clones come out make sure you have 2 felrushs up and just get to him as fast as possible (i dont think i killed any of the ghosts) Save meta for phase 2
there is a slight gap between phases where if youre fast enough you can swap talents (i kept mine the same) but make sure you have nemesis for P2.
phase 2 - drums, pot, meta on the boss get him as low as you can (i saved meta till after the 1st add wave), save eyebeam, when the adds spawn eyebeam, blade dance, chaos nova. when you get on the boss for the 2nd time use meta and you should be able to kill him, if you get another wave of adds your eyebeam should be back up. i screwed up and had an add get to him and he healed from 1 of them and was still able to meta, stand in the goo and finish him (leech was stronger than the goo ticks).