Diehard

(General)
You are especially hard to kill. Not only do your wounds automatically stabilize when grievously injured, but you can remain conscious and continue to act even at death's door.
 

Prerequisites

Endurance.
 

Benefit

When your hit point total is below 0, but you are not Dead, you automatically stabilize. You do not need to make a Constitution check each round to avoid death. You may also choose to act as if you were Disabled, rather than Dying. You must make this decision as soon as you are reduced to negative hit points (even if it isn't your turn). If you do not choose to act as if you were Disabled, you immediately fall Unconscious. When using this feat in this way, you are Staggered. You can take a Move Action without further injuring yourself, but if you perform any Standard Action (or any other action deemed as strenuous, including some Swift Actions, such as casting a quickened spell) you take 1 point of damage after completing the act. You can still die from negative hit points as described in the Injury and Death article.
 

Normal

A character without this feat who is reduced to negative hit points is Unconscious and Dying.