You are able to imbue an arcane spell with holy or unholy energy.
Benefit: A divine arcana is an arcane spell that you have imbued with divine energy so as to become holy or unholy (depending on whether you channel positive or negative energy). The Difficulty Class to resist a spell imbued with such energy increases by 2 for creatures that do not share the alignment of the spell (good for holy spells or evil for unholy spells) or by 4 for creatures with the opposite alignment. The Difficulty Class does not change for creatures which share the spell’s alignment. A divine 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.