Spell chargenegative Neutral 15 Subtraction (25 player) 10 Money achievement
Defeat Combat 15 Thaddius in Naxxramas with less than 21 people in 25-player mode.

Heroic: Subtraction is an end game raid achievement. Completing this achievement is criteria for the meta achievement Inv helmet 06 [Glory of the Raider (25 player)].

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