What you are in the dark (is beautiful) (джен)

From a prompt on Norsekink: "Instead of a prison for Loki, Odin casts an old and little-used spell on him. The spell is designed to turn a person into what they are at heart: good people become glorious, cruel people become hideous.
Everyone expects him to become a hideous old man or some such. So it rather ruins Odin's punishment when the result is a being made of ice and fire and light, covered in the cruel wounds of loss and deep pain but still more beautiful than anyone in all the Nine.
Because seriously, Loki had the patience of a saint to not burn the whole palace down years ago and a nearly endless font of loyalty to fight alongside either Odin or Thor considering how he was treated."
I hope I did it justice.