A small collection of teeth, small scales, knots of hair, and strange bits of jerky fills this pouch.

The worn leather bag’s strings are long enough to allow the pouch to be worn as a necklace.
This item is keyed to a single type of creature (aberration, animal, magical beast, and so on). A pouch keyed to humanoids or outsiders must be keyed to a subtype as described in the ranger’s favored enemy ability. While wearing an enemy spirit pouch, you gain a +1 competence bonus on attack rolls against creatures of this type.
If you are a ranger, the pouch increases your favored enemy bonus against creatures of its type by 2. If you don’t have the favored enemy ability, the pouch grants you a +2 bonus on damage rolls and certain skill checks as if that type of creature were your favored enemy.
If a creature of the type keyed to the pouch wears that pouch, it receives one negative level. The negative level remains for as long as the pouch is worn and disappears when it is no longer carried. The negative level never results in actual level loss, but cannot be overcome in any way (including restoration spells) while the pouch is worn.

Prerequisites: Craft Wondrous Item, detect animals or plants, ranger with favored enemy type/subtype matching that of the pouch.
Cost to Create: 1,000 gp (plus 100 gp for base item), 80 XP, 2 days.