Sjonhverfing

"Sight altering." Sjonhverfing is the art of tricking one's perception. It is illusion magic in its simplest sense. It can be used to change one's form or the form of other things, visually. It is not to be mistaken with
Loki, God of Mischief and Utgard-Loki are both masters of it.
Humans are rarely taught how to use it.