To Have Faith Is To Have Wings

Every monster has their own wings, and they reflect their emotional state. Wings are affected whenever their soul is affected, and vice versa. These wings are unable to lift them, and instead are often used as ways of showing affection, comfort, and protection, of their loved ones, while also used to intimidate or threaten enemies. In battle, these wings take any damage that the monster would have taken, as they are used as shields. The removal of a monster's wings is a cruel and unspeakable thing. To do so would be to remove a monster's defenses entirely and to reduce both their health and the strength of their attack to one. They turn to dust upon removal, and then dissolve into nothingness within the next minute, leaving behind only a couple of feathers. Wings cannot be grown back; a monster only has one pair their entire life.

An Undertale Alternate Universe two-shot.