You eat at least a portion of the brain of another creature's corpse. Roll a d20. On a 15+, you gain the creature's memories and knowledge to some degree, recalling any important fact known to the creature - family history, recent events, the general layout of the creature's stomping grounds, details about the creature's death, important plans, passwords, magic item command words, and similar tidbits. Skills, feats, spells, and other such knowledge cannot be obtained in this fashion.
Once you roll to determine whether she recalls a fact, she cannot attempt to recall that fact again.