You imbue an arcane spell with the neutral energy of nature.
Benefit: A Natural Arcana is an arcane spell that you have imbued with divine energy so as to become a neutrally aligned spell. The Difficulty Class to resist a spell imbued with such energy increases by 2 for creatures that have one non-neutral alignment (such as a creature that is neutral good) or by 4 for creatures with two non-neutral alignments (such as a creature that is lawful evil). The Difficulty Class does not change for creatures which are neutral. A Natural Arcana spell must be an arcane spell and it uses up a spell slot 2 levels higher than the spell’s actual level.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.