Aster's minor in mythology brought him to plenty of places to study. And his interest in curses and convenient lycanthropy makes acquiring and removing curses fairly easy.

The Fae of the forest thought they could pull a fast one on him. Exposing him to enough fairy dust to keep him fluttering in the forest forever, but with a little bit of knowledge and a newly acquired magic he would be able to hide his wings and leave the forest as he pleased

Art by   Kiri-Anko