Demonic Conduit( Fiendish Codex I: Hordes of the Abyss, p. 85)
Your evil brand incorporates blasphemous runes and sigils that augment magical attacks you make against lawful and/or good targets.
Evil Brand (FCI) ,
The save DC for any spell you cast against a lawful or good creature increases by 1. Against lawful good targets, the save DC increases by 2.