Efficient Metamagic

Notes:
 * Efficient Metamagic are a group of item enhancements which reduce the cost of improving your spells with metamagic. They were introduced to the game with Module 5 and were initially called Improved Empower, Improved Extend and such, but were then renamed in order to avoid confusion with the caster enhancements of similar names.
 * These effects stack with the similarly-named enhancements, but do not stack with like item effects. i.e., Efficient Metamagic - Maximize I and Efficient Metamagic - Maximize II do not stack, only the higher effect would apply.