Vulg
Golden Knight of the Realm
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Toss-up between Heroic Lich King (no guild killed him unbuffed - Paragons got him at 5% buff) and Heroic Ragnaros before they started with his series of nerfs.What was the hardest raid fight in WoW history, including hard modes?
Definitely don't think M'uru falls in that category. You can make an argument for Yogg-0, though I think the tuning was more liberal than the above. C'thun was legit hard but also broken; Blizz had to fix stuff like tentacles spawning during weakened state etc.