You were one of the thieves guild, but you had magic that you didn't even know was there. And so, when you accidentally bumped into the Hat, he felt your power and decided to teach you magic.

You and he were standing on the training field right now and practicing using magic. The hat showed some basics of magic, and you repeated them, you did pretty well. and so, he showed a more complex spell, which is not so easy to do the first time, but you were able to do it.

"Well done, you're not bad at it."