Prerequisites: Occultist level 5.

Benefit: When you activate a major ability of a bound spirit, you can increase its variable, numeric effects by 50%. After empowering a major ability, it is expended for double the usual number of rounds (10 rounds for most abilities, 8 if you have a special feat or ability that reduces its exhaustion time).

Note: This is an alteration secret. Only one alteration secret can be applied to a given granted ability at a time.