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Each point of mastery among all of your hired workers adds to your total mastery. For example: you have 4 workers with Mastery of 5, 10, 12, and 14. This gives you a total of 5 + 10 + 12 + 14 = 41 mastery. Each item you produce is made with 41 mastery.
There is currently no public formula relating your amount of mastery to the quality of an item being crafted.
The Mastery level of a worker can't exceed the level of it's highest skill, worker building bonuses don't count towards the maximum level of Mastery.Max Mastery for Free-2-Play and Pay-2-Play with 2 skills lost. (Jeweler and Sorceress are changeable for your personal preference)