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

Bloodstained Treatise

ITEM 7
Price 325 gp
Usage held in 1 hand
Bulk L

The white leather cover of this book is splotched with rusty red bloodstains, and its pages seep red when turned, although this never stains the bearer's hands or clothing. Anatomical drawings illustrate its pages.

Activate—Sanguine Expulsion (concentrate, spellshape)
Frequency once per day

Effect If your next action is to Cast a prepared Spell that manipulates blood, such as blood vendetta or vampiric exsanguination, or a spell dealing piercing or slashing damage, all targets of the triggering spell take 1d6 persistent bleed damage; if the spell already causes bleed damage, the bleed damage increases by 1d6. The wounds of one affected target (chosen by you) gush uncontrollably, covering the ground with blood in a 5-foot emanation that lasts for 1 round. Creatures that begin their turn in the blood must succeed at a Reflex save against your spell DC or fall Prone.
Pathfinder Impossible MagicORC