From Pathfinder #150: Broken Promises, which isn't enabled.

Song of the Fallen

FEAT 20

Prerequisites focus pool

The moving power of your songs can stir the spirits of the dead to rise once more and fight alongside you. You learn the Song of the Fallen composition spell. Increase the number of Focus Points in your focus pool by 1.

Pathfinder #150: Broken PromisesOGL