"Anyone can draw a map, boy - there's no more difficulty in that than laying brick. What makes maps useful is when they are so proper, so precise, that they are living images of the places they represent. Encompassing knowledge of the geography, and mastery of the very space itself - that, child, is cartogramancy."
- Sage Pakpao Sasithorn, Chief Lecturer, the Ezagun-Darkbolt College of Cartogramancy
A possible answer to what happens to spells when a mage dies. If the spell is strong enough, say and enchantment or other permenant effect, part of the mages spirit may become lodged in the magic. It may be a way for items to gain some kind of intelligence, but a mage who has knowledge of this fact would be very hesitant about enchanting anyone or thing. He might have other plans for his afterlife than counting the change in your bag of holding.
Preists, I think, would have this sort of thing covered.