Abilities 3 of NPC: Imperial Fire Guardian

You Reduce damage of all types other than Crit ("Critical") Damage. Critical Damage cannot be Absorbed, Resisted, or Withstood and bypasses most defenses. If you are Subdued by Critical Damage, you are immediately Slain. When damage is Reduced in this way, you must say "Reduce." Once bypassed, the Immunity resets after you Rest. Only Stigmas may use this Immunity, and only if one of the Stigma's Flaws is a Damage Vulnerability.