Forum:Mystic scroll?

My question is about http://castleage.wikia.com/wiki/Arielle, and specially that part

" You will need a Mystic Scroll in your Quest Stash in order to rescue a princess. Make sure you have at least one before searching the tents. Mystic Scrolls you do not use in one run will still be in your Quest Stash on the next run. "

Could someone tell me where do I get this Mystic Scroll thing from???