It is already an offense to worship a deity other than your own, even more so if you are an Angel in the service of the Almighty.
This Angel has been discovered paying homage to the devil himself. Our Lord, upon discovering this treason, has imposed, in addition to banishment, a quite exemplary punishment.
Now this angel is at the disposal of humans, so that they can do with him what they want. He has offered some alternatives to shame him.
You can change his appearance (which the Angels hate) between 3 variants:
His own skull, the mask of the primordial warriors, or that mask for which he is condemned.