Exultant Blood Magic
FEAT 18 Surging Blood Magic; legendary in Arcana or Religion, depending on your chosen tradition
The magic in your blood sings an exultant song of battle. You gain the master spellcasting benefits. Increase the spell slots you gain from the bloodrager archetype feats by 1 for each spell rank. In addition, when you Cast a Spell from your repertoire and you are at least Drained 2, double the extra damage dealt by that spell from Rage instead.
Pathfinder War of ImmortalsORC