From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Mortalis Coin

ITEM 4

CONSUMABLE MAGICAL TALISMAN

Price 20 gp

Usage affixed to armor

Bulk —

Category talisman

Activate (concentrate)

Trigger You are reduced to 0 Hit Points by damage but not immediately killed

Requirements You are an expert in Fortitude saves.

This small golden coin is usually stamped with the image of a boar or other resilient creature. If the triggering damage would cause you to become dying 2 (typically due to a critical hit or your critical failure), you become dying 1 instead. In addition, for 10 minutes, you die from the dying condition at dying 5, rather than dying 4.

Effect: Mortalis Coin

Pathfinder Treasure Vault (Remastered)ORC