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

Undead Hunter

FEAT 1
Prerequisites newly minted automaton heritage

You were created by a Nexian mage specifically for the purpose of fighting undead, and you are infused with vitality magic. You gain Vitality Lash as an innate divine cantrip.

Enhancement You can infuse your attacks with vitality. You can cast Infuse Vitality as a 3rd-rank arcane innate spell once per day, targeting only yourself.

Pathfinder Impossible MagicORC