You Are What You Eat

Feats

At 14th level, a flesheater learns to awaken the abilities of creatures whose bodies she consumes. Whenever she devours a creature, she gains a special ability based on the creature's type (dragon, fey, magical beast, outsider, or undead), which she can use as a standard action at the cost of two essence points. Abilities gained this way are not affected by spell resistance. In addition, the maximum number of essence points the flesheater can hold increases to 3.