‘You are freed from all cares brothers and sisters! All worries! All need to toil and labour for the baron’s taxes, in the guild’s fields and for the peddler’s wares! All the drink you could ever need!’
Final words of an extremely drunk hedge conjurer by name of Oates Greenlock.
"A demonic plant? Don't be daft, go research something useful to society."
"But-but the p-plant! It's evil! It must be destroyed!"
"Now the flowers bloom all year round thanks to the most holy Spirit of Urban flora. It just takes a little blood."
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.