I am stuck at Cull Obsidian stage 8. Using A1 (L) - Iron Man (DPS), Iron Man has a 120% damage proc, but he doesn't do enough damage even if I always proc it on the 5th skill. I have 215 valor and the stage requirement is 84. Do I just need a higher proc?
Also, what is a safe rotation for Iron Man? I do 3-5-4-2, but he ends up taking damage and by the second phase when I get Cull down to about 5-6 bars he dies.