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From Pathfinder #160: Assault on Hunting Lodge Seven, which isn't enabled.

Poisoner's Staff

ITEM 4
UNCOMMONMAGICALSTAFFTWO-HAND-D8
Price 90 gp
Usage held in 1 hand
Bulk 1
Category simple
Group club
Damage 1d4 bludgeoning

This gnarled staff is covered with thorns and coated with a glistening lacquer that acts as a minor irritant. While holding the staff, you aren't affected by its coating or thorns, and you reduce the DC of your flat checks to overcome persistent poison damage from 15 to 13.

Activate Cast a Spell
Effect You expend a number of charges from the staff to cast a spell from its list.
Craft Requirements Supply one casting of all listed levels of all listed spells.
Pathfinder #160: Assault on Hunting Lodge SevenOGL