Yeah, and I changed my robes green because I think summoners are cool kids and not those lame emo kids who don't have friends.

I don't remember why summoners have to have horns but they put one in my hat in class and insisted it was useful. It wasn't even all that magical one. Now, a Unicorn horn has a ton of magic in it.

So, if any horn has a chance of breaking the boundaries of this reality and the next, it's a Unicorn's.