You learn how to apply the lessons from all areas of your life to improve your spellcasting.
Prerequisite: Caster level 1, levels in two character classes.
Benefit: Select two classes you have levels in and can continue to advance in. The first class selected must have a caster level, and the second class cannot have an ability that increases the caster level of your first class. You gain a bonus to your caster level in your first class, equal to the levels you have in the second class.
Special: You can take this feat more than once. Each time you take it, you must select a different class as your first class.
Adventurer’s Handbook: Genius Guide Volume 1