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Mastery is a mechanic for transformations that allows you to reduce the Ki drain and even unlock new forms altogether. Mastery increases gradually upon taking damage or preserving the form for a certain period of time. Super Saiyan 1 mastery can also only be increased while in the Base SSJ1 form, ASSJ, and USSJ, if u have the Prodigy trait the mastery will be faster.
All forms that have mastery display a message upon mastering the form, with Super Saiyan 1 also having messages for its other mastery unlocks.