Spellbook Swap

This Lunar spell gives the caster the choice to switch between one of there enabled spell books for only ONE spell. A good example of this is say a player will be on the lunar spell book, then they will cast this spell and choose modern spell book now they have the chance to use one modern spell just once. they can contiue doing this if they keep recasting the intial Lunar spell. This works in the same way with the Ancients spell book.