Death's Door

Frequency once per 10 minutes

Trigger You take damage that would reduce you to 0 Hit Points.

You continue to fight when others would fall. Just before taking the triggering damage, you gain temporary Hit Points equal to twice your level. If you have Hit Points remaining after gaining these temporary Hit Points, you aren't knocked unconscious, nor do you suffer the other effects of being reduced to 0 Hit Points. Any temporary Hit Points that remain after applying the damage last for up to 4 rounds.