Remain Conscious( Oriental Adventures, p. 65)
You have a tenacity of will that supports you even when you are disabled or dying.
When your hit points are reduced to 0, you may take one partial action on your turn every round until you reach -10 hit points, or your hit point total returns to 0 or higher. If stabilized, you can continue to take partial actions, but the first partial action you take revokes the stabilization. If you reach -10 hit points, you die.