Unconciousness
When your hit points reach 0, rather than falling dead, you will instead be rendered unconscious. The screen will darken, you will be unable to speak or act, and the damage you sustained will do battle with your own personal regeneration rate. You remain unconscious until such time as you have regenerated a sufficient amount of hit points and stamina or you ultimately succumb to your wounds. Since you are entirely helpless at this point and with access to regeneration is somewhat limited, it's prudent to adventure with a partner to watch over each other in case of sudden forcible loss of consciousness.