Originally Posted by
mypally
the mechanics themselves were not hard, non of the mechanics in vanilla were. What made it impossible was the health of the adds, the rate of spawn, and the fact that they never stopped spawning. You could just barely keep up with the adds with the full raid focused on them, that left no time to dps cthun, which made it an impossible encounter until they nerfed/fixed it. Its is somewhat analogous to herioc LK at 0% buff i suppose. But to make it feel more similar, imagine valks and vile spirits and defiles never stop spawning, even in transition phases.