pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Instructions for Lasting Agony

ITEM 5
GRIMOIREMAGICAL
Price 200 gp
Usage held in 1 hand
Bulk L

This worn and stained manual emits a chill when opened.

Activate—Excruciating Spell (manipulate, spellshape, void)
Frequency once per day
Effect If your next action is to Cast a prepared void Spell that allows a saving throw, you warp and twist the energy of the spell to cause intense pain. If the target fails its saving throw against the spell, it becomes Sickened 1 by the pain.
Pathfinder Impossible MagicORC