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

Frost Fair Yanyuedao

ITEM 14

UNIQUE ARTIFACT COLD DEADLY-D8 FORCEFUL REACH

Usage held in 2 hands

Bulk 2

Category martial

Group polearm

Damage 1d8 slashing

The Frost Fair Yanyuedao is a +2 greater striking yanyuedao (use statistics for glaive) once wielded by a legendary military general from Goka. This weapon was constructed from pieces harvested from a dragon's body. When in an area of severe cold or colder, the Frost Fair Yanyuedao becomes a +3 major striking yanyuedao with a glowing blue cutting edge and the following ability.

Activate—Dragon Chill (manipulate)

Effect Until the end of your turn, the Frost Fair Yanyuedao gains the effects of a Greater Frost rune. While under this effect, if you critically succeed at a Strike using this weapon against a creature who has resistance or immunity to cold, that creature must attempt a DC 31 Fortitude save or be Slowed 1 for 1 minute.

Effect: Dragon Chill

Pathfinder Lost Omens Tian Xia Character GuideORC