Soul Empowerment

Allows the usage of souls as a material component for spell manipulation. The spell is more effective when cast and the caster may choose to make the spell more difficult to overcome via saving throws, deal more damage, or allow the caster to be more accurate when casting. Consuming one soul from a source as a component in spell casting will allow the caster to add an additional +4 to the spell's DC or damage die. Charging a spell with this feat requires one action, and the effect will be added to the next spell cast by the caster. For example: a spell caster uses Phantasmal Killer on an opponent and empowers this spell with a soul. As part of the casting process the caster may consume the power of the soul to empower the spell. The caster chooses to make the spell more difficult to overcome adding a +4 to the DC of the saving throw (in addition to the DC the caster has). The caster may also use part of their own soul to empower spells (through bloodletting for example), but excessive use places the caster at risk of becoming soulless. The amount of times an individual can use this ability before becoming soulless is determined by the average of the individual's Intelligence and Constitution stats. For example: An individual with 10 Constitution and 18 Intelligence can use the Soul Empowerment feat using their own soul a total of (10+18)/2 times. The amount spent is based on the level of a spell. Empowering a Level 5 spell requires the caster to spend 5 points out of their personal soul pool to empower the spell. Consuming a soul from a receptacle (such as a soul pouch or soul jar) consumes the whole soul and empowers the spell once regardless of how high the individual soul's Intelligence and Constitution was in life. 

An individual may empower their spell in multiple increments, but must spend a round doing so per bonus. Increasing your Intelligence or Constitution would increase the total pool available to the caster.