For those warlocks that may be struggling with the boss, I'm sure you have done your research, but doing it like this helped me. Good luck!
The gateway was bugged dude. They recently fixed it. Myself and Fattymogu did it without the portal! :D
.i feel like used the charge more.cool video though, i was wondering what came after the doomguard.
I !@#$ed up my charge rotation on the kill...i normally tried to use it on CD...i think you can fit 5 charges in before the first cataclysm. Hectic fight :P