The Hundred Club (25 player) is a dungeon & raids achievement earned for defeating Sapphiron in Naxxramas on 25-player mode without any member of the raid having a frost resist value over 100.
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Patch changes[]
Patch 3.2.0 (2009-08-04): Renamed from Heroic: The Hundred Club to The Hundred Club (25 player).
Patch 3.0.2 (2008-10-14): Added.