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@jon3800
Assuming you have Mythic Silver
It takes 50K to upgrade from Mythic Silver to Gold,
It takes 50K to upgrade from Mythic Gold to Azure
It takes 70K to upgrade from Mythic Azure to Emerald
It takes 30K to upgrade from Mythic Emerald to Amethyst
It takes 70K to upgrade from Mythic Amethyst to Diamond
So you need a total of 220,000 feathers per bird (total 1,540,000) to upgrade fully.