pf2e.fyi
From Pathfinder #219: Lord of the Trinity Star, which isn't enabled.

Momentary Respite

FEAT 16
Archetype Heroic Scion

Frequency once per day

Trigger You lose Hit Points from persistent damage. Your sense of destiny manifests as rapid physical healing. Spend a Mythic Point. You regain 8d8 Hit Points and remove any persistent damage condition affecting you. Until the end of your next turn, you're immune to persistent damage (though you would take any other effects of an attack or spell that would also give you persistent damage).
Pathfinder #219: Lord of the Trinity StarORC