pf2e.fyi
From Pathfinder Adventure Path: Bastion of Blasphemies, which isn't enabled.

Bonebloom Rose

ITEM 12
Price 300 gp
Usage held in 1 hand
Bulk —

Activate (concentrate, manipulate)

A bonebloom rose appears as a blue-petaled rose, often found growing within the ribs of a skeleton buried in a grave under Pharasma's protection. These consumable items can also be crafted as any other item. When you activate a bonebloom rose, you inhale deeply from its petals while squeezing the stem hard enough that its thorns painfully (but otherwise harmlessly) pierce your flesh. The rose then withers and crumbles to dust, and you gain 40 temporary Hit Points for 1 hour. As long as you have at least 1 of these temporary Hit Points remaining (and they haven't been replaced by temporary Hit Points from a different source), your Strikes deal an additional 2 spirit damage to undead.

Effect: Bonebloom Rose

Pathfinder Adventure Path: Bastion of BlasphemiesORC