I've had this idea for a while, inspired by a couple of different sources, and I'm looking for some advice. What I'd like to do is develop a mechanic that when the party finds magic items that maybe can't be used or sold have a way to reuse that magic that is contained in the item. Example: party defeats evil cleric and now has a +3 unholy mace. what to do with this item. can't sell it, because the market for the item is evil creatures/people. seems a waste to destroy it. why not come up with a way to remove the magical essence and place it into a new object of equal or lesser strength with different properties? maybe have a flaming weapon? or switch it to a holy item? or go with bracers or armor?
The other idea is to drain the magic from the item to cast spells. essentially using the magic in the item to power your spells.
Any thoughts?