Your training in magic included a few unusual lessons.
Prerequisite: Ability to cast 0-level spells.
Benefit: Pick one 0-level spell. It need not be a spell on your class’ spell list. You can cast this spell at will. You cast it as if it were a spell from your class list.
Special: This feat may be taken more than once. Each time it is taken, you select a new 0-level spell to cast at will.
Adventurer’s Handbook: Genius Guide Volume 1