Epic/Legendary grade costumes/guardian tablets you obtain will be in [Confirmation Pending] status.

For costumes/guardians in [Confirmation Pending] status, you must enter the costume/guardian menu and proceed with confirmation in the [Confirmation Pending] tab for final acquisition.
(1) Go to Costume/Guardian > Confirmation Pending tab
(2) Click on the obtained Epic grade or higher costume/guardian > [Re-roll] or [Confirm]

Re-rolling consumes diamonds based on card grade and number of attempts. In confirmation pending status, you have 3 chances to change to a different costume of the same grade.
If the confirmation time expires, the most recently drawn tablet will be confirmed. Re-rolling is optional for adventurers