From Pathfinder Lost Omens Cheliax, Infernal Inheritance, which isn't enabled.

Pike of the Monster Slayer

ITEM 13

UNCOMMON REACH

Price 3000 gp

Usage held in 2 hands

Bulk 2

Category simple

Group spear

Damage 1d8 piercing

This +2 greater striking longspear has the skull of a horned beast mounted to the crossbar. During your daily preparations, you can douse the skull in the blood of a monster; the weapon gains the effects of a bane rune until your next daily preparations, targeting a trait of the creature which supplied the blood.

Activate—Blood of the Beast (manipulate)

Trigger You reduce a non-humanoid creature or giant to 0 Hit Points

Effect You impale the creature's heart, thrusting it through the beast's back and exploding it in a shower of blood. Creatures within a 15-foot cone originating from the creature take 10d6 acid damage with a DC 30 basic Reflex save. On a critical failure, they're also Blinded until the end of their next turn as they're coated in blood.

Pathfinder Lost Omens Cheliax, Infernal InheritanceORC