Arcane Savant (Feat)

Your prowess at spell-casting improves with experience. Even totally unrelated experience.

Prerequisites: Arcane Caster Level 21

Benefit: Select one arcane spellcasting class in which you have reached a caster level of at least 21st level. When multi-classing, your caster level in that class is calculated as your total character level instead of your class level. This does not affect any other class-dependent benefits such as bonus feats or spells per day, only your caster level.