"Mageprice is part of doing one of those kinds of magic," he explains. "When a Wildmage does a spell, the Wild Magic sets a mageprice, and if they want the spell to happen they have to agree to whatever it is. For small spells it's small things, and for bigger spells it's bigger things. But it's usually not paying things like money or treasure; you could think of it as... doing the Wild Magic a favour in exchange for the spell. And whatever the favour is, it's always either something that helps the spell come about by you doing it, or something that helps make the world a little better even if it's not in an important or obvious way, or both."