Spell chargenegative Neutral 15 Subtraction (10 player) 10 Money achievement
Defeat Combat 15 Thaddius in Naxxramas with less than 9 people in 10 player mode.

Subtraction is an end game raid achievement. Completing this achievement is criteria for the meta achievement Inv helmet 22 [Glory of the Raider (10 player)].


Combat 15 Thaddius is located somewhere within Naxxramas.

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