A suggestion, gleaned through playtesting. 
Scrolls are similar to Spellbooks, however: 
• They do not take up an inventory slot.
• They do not cause fatigue.
• They disappear after one use.

Are there any rules already laid out in Cairn for creating scrolls? Like...a variant on Vancian magic that could make a lot of sense would be that magic users who don't want to risk lugging their books around could prepare a certain number of one-use scrolls per Long Rest?