Warlock Utility 16Amaan's Continuance
Invoking the remnant of a dead god, you borrow its lingering power to act when you would normally lie on the ground, bleeding.
No Action Personal
Trigger: An attack reduces you to 0 hit points or fewer and doesn’t kill you
Effect: Until the end of your next turn, you do not become unconscious from having 0 hit points or fewer.
Published in Arcane Power, page(s) 82.