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The Hundred Club (10 player)
Defeat Sapphiron in Naxxramas without any member of the raid having a frost resist value over 100 in 10-player mode.
The Hundred Club (10 player) is earned by defeating Sapphiron in Naxxramas without any raid member having a frost resistance value exceeding 100 during the fight.
Check Frost Resist Buffs
Before engaging Sapphiron, ensure no raid member has frost resistance-boosting buffs or armor active — for example, a mage casting Ice Armor instead of Molten Armor will disqualify the entire raid.
Defeat Sapphiron Normally
Enter Naxxramas and defeat Sapphiron as normal — since frost resistance was removed from the game in patch 5.0.4, the achievement is earned automatically as long as no player activates an ability that manually grants frost resistance above 100 during the encounter.
Tips
Frost resistance is checked per damage application throughout the fight, so dropping and reapplying a resistance-granting effect mid-fight will still cause disqualification.