From Pathfinder Lost Omens Gods & Magic, which isn't enabled.

Rat-Catcher Trident

ITEM 11

UNCOMMON MAGICAL THROWN-20

Price 1200 gp

Usage held in 1 hand

Bulk 1

Category martial

Group spear

Damage 1d8 piercing

The haft of this +2 striking trident is carved with intricate designs of swarming rodents sacred to Hanspur, the drowned god of the Sellen River.

When used against a swarm, it ignores the swarm's resistance to piercing damage, if any.

Activate Interact

Frequency once per day

Effect While floating down a river on a raft or boat, you plunge the rat-catcher trident into the water. The trident casts a 5th-rank Control Water spell on the body of water.

Pathfinder Lost Omens Gods & MagicOGL