Actually I think I have one issue. If warlocks are supposed to be masters of the AE then they need their AEs to actually hit. Unfortunately on AE encounters typically the only debuff helping you out on the adds and only within the one encounter is going to be your AE debuff. This resists and is also not a huge amount. If it's multiple non-linked encounters it's even worse, the adds will have just about no debuffs on them. When I get multiple encounters it's pretty typical to have multiple cataclysm resists and such, and this rather defeats much of the purpose of casting them in the first place. My suggestion would be to give warlocks some sort of PBAE noxious debuff. This could replace curse of luclin. My personal idea would be an anchored noxious debuff that pulses around an anchor mob like netherealm. You could also just put a debuff component on netherealm itself. You could make AE spells much harder to resist too, but I think the other suggestions are more fun.