From Elitist Jerks, for nonbelievers:
Mastery is your most valuable secondary stat after spell hit cap and acts on well over 50% of your damage composition (IP, DP, Envenom, and Venomous Wounds) by increasing the bonus you get from Potent Poisons. Baseline Potent Poisons increases your poison damage by 28% and 3.5% for every point of mastery you have (179.28 rating). Similar to expertise, mastery is also not truncated and each point of mastery rating will increase your poison damage.
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