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Threadmarks: Atsu-Atsu no Mi Rank and Tier Boosts
I would say C and gives like
21 Mastery Boost: +5 strength
41 Mastery Boost: +5 strength, +5 vitality
61 Mastery Boost: +10 strength, +5 vitality
81 Mastery Boost: +15 strength, +5 vitality
100 Mastery Boost: +15 strength, +10 vitality
@Ichimonji @kakashi19283