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PFS StandardHero's Defiance [free-action] Focus 10

Uncommon Champion Concentrate Focus Healing Vitality 
Source Player Core 2 pg. 256
Trigger An attack would bring you to 0 Hit Points.
You shout in defiance and are filled with a burst of healing. Just before applying the attack's damage, you recover 6d8+20 Hit Points. If this is enough to prevent the attack from bringing you to 0 Hit Points, you don't become unconscious or dying. Either way, cheating death is difficult, and you can't use hero's defiance again until you Refocus or make your daily preparations. Hero's defiance can't be used against effects with the death trait or that would leave no remains, such as disintegrate.