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@bubbley
@grimmjow I just played Cave 11/4. I gained mastery towards rank 61. So you gain mastery just by playing. All my birds were 60/15 before the update now they are all 60/60 but each has some towards rank 61. Each has a different amount to reach 61. I don’t know why this should be I have only played the event and the Cave just now. The only birds I have used are Paladin, Wizard and Spies.