You read the piece of paper. It's actually a note.

"Dear unknown buff man. Yes, that's you. May I call you John? Is that your name? I'll call you Jeffery. Okay, Johnny, I am a magical wizard. My name is Brokthor, the Mage. As you may know, somebody actually tried to kill you. You were locked up because you were close to the truth.
The 'truth' being the fact that somebody you used to know is evil, I guess. You didn't tell me. To save you from an evil spell, I gave you amnesia and somehow the hut I
DIDN'T lock you in caught on fire. I suggest you don't try looking for me because by the time you get this note, I might be dead!
Well, okay not dead, just far away. Far, far away.
Anyways, here's a sword. May it prove useful to you.
And for the whole amnesia thing, you were looking for the reason your village disappeared out of nowhere. Get to it, then!"
A wizard?