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From Pathfinder #173: Doorway to the Red Star, which isn't enabled.

Wyrm Drinker

ITEM 17
UNIQUEMAGICALSTAFFTWO-HAND-D8
Price 13000 gp
Usage held in 1 hand
Bulk —
Category simple
Group club
Damage 1d4 bludgeoning

This staff is made from the femur of a gold dragon wrapped in the multicolored scales of every type of chromatic and metallic dragon. When wielding this staff, you gain a +1 circumstance bonus to skill checks to Coerce, Make an Impression, Request, or Lie to dragons and creatures with strong draconic ties (such as kobolds, dragon instinct barbarians, and draconic sorcerers).

Activate command, Interact
Frequency once per day
Effect Attempt a melee Strike with Wyrm Drinker. If your target is a dragon or a creature with a strong draconic tie, such as a kobold, and you damage the target, the target is Drained 2, or Drained 4 on a critical hit.
Activate Cast a Spell
Effect You expend a number of charges from the staff to cast a spell from this list.
Pathfinder #173: Doorway to the Red StarOGL