From Pathfinder Lost Omens Tian Xia Character Guide, which isn't enabled.

Twisting Gale

ITEM 14

UNCOMMON BACKSWING DISARM FORCE MONK PARRY

Price 4200 gp

Usage held in 2 hands

Bulk 2

Category martial

Group flail

Damage 1d8 bludgeoning

This +2 greater striking impactful sansetsukon is made of metal colored pale blue that echoes howling winds when swung and emits the force of a storm when it connects.

Activate—Sonic Gale (concentrate, force, magical)

Trigger You critically hit with the twisting gale

Frequency once per 10 minutes

Effect The energy of your follow-through erupts from your opponent in a wave of concussive energy. You deal sonic damage equal to your normal Strike damage with the twisting gale in a 30-foot cone behind your target. Creatures in the area, not including your target, must attempt a basic Fortitude save against your class DC.

Pathfinder Lost Omens Tian Xia Character GuideORC