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

Soulpiercer

ITEM 12

DEADLY-D8 DISARM FINESSE INVESTED

Price 1900 gp

Usage held in 1 hand

Bulk 1

Category martial

Group sword

Damage 1d6 piercing

The long, thin blade of this +2 astral striking low-grade silver rapier is fashioned from liquid quicksilver, magically frozen and tapered to a deadly point.

Activate—Extend (concentrate)

Frequency once per 10 minutes

Effect You swing the soulpiercer in a wide arc, extending its quicksilver blade. Your Strikes with the soulpiercer have a reach of 15 feet until the end of your next turn.

Activate—Grant Mercy (concentrate, manipulate)

Frequency once per day

Effect You cast a 5th-rank Phantom Pain (DC 28).

Pathfinder Lost Omens Cheliax, Infernal InheritanceORC