Costume Key

Costume Keys are found in the inventory under General tab. 5 keys are good for one Costume Summon at the Costume Chamber, which is available for 48h from the 3rd Monday of the month on.

You gain Costume Keys by completing stages in the Costume Quest during the same time. There are 6 stages awarding 1 to 3 Keys for 10 Keys in total.

Possible sources for Costume Keys:

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