Will try again to post how a mage can top dps at Chogall. Got banned last time by a warlock calling my retarded or something. I guess that he could not see beyond his/her intelligence.
@Chogall: A tactic to beat the soft enrage timer, 4 adds, it is possible to allow yourself to be corrupted, 100 stacks, in order to get the buff
Corruption: Absolute. That will make you not able to be healed at all but your spells are instant and does 100% more damage. It will make you own the dps with instant pyroblasts.
However since you can not be healed you need to avoid damage. Chogall cast his shadow orders which is a aoe damage that you need to ice block. To get out the most you should survive 2 Shadow Orders phases.
Logs where at least the top 3 mages are using this strategy, just to prove to the mage wanna be warlock that banned me last time that either it is not retarded or at least that retarded people can dps.
World of Logs - Real Time Raid Analysis