Die Hard

 
Prerequisite(s): Endurance
 
Benefit: When reduced to -1 to -9 Hps, you automatically become stable, you need not roll to see if you continue to lose hit points. When reduced to negative hit points you can choose to be either disabled or unconscious. If disabled, you cannot do any strenuous activity and can only move or make a standard action. If you attempt any strenuous activity, you lose another hit point. At -10 you still die.
 
Source: Players Handbook