Death & Dying

A couple more sections from OSRIC, important enough to quote directly:

Damage and Death 

When a character or creature is hit, the amount of damage is deducted from his or her hit points. When hit points reach 0, the character is unconscious and will continue to lose one hit point per round from blood loss until death occurs at –10 hp. Note that any additional damage suffered by an unconscious character (aside from bleeding) will kill him or her instantly. The blood loss of 1 hit point per round may be stopped immediately in the same round that aid of some kind is administered to the wounded character. Being knocked unconscious is quite serious; even after returning to 1 or more hp (by means of a healing spell, potion, or natural rest) the character will remain in a coma for 1-6 turns and must rest for a minimum of one week before he or she will be capable of resuming any sort of strenuous activity, mental or physical. If a character is reduced to –6 hit points or below, the scars of the wound will likely be borne for the rest of the character’s life. 

Characters who are slain may be raised from the dead if a cleric of sufficient level is available to perform the casting (exception: elves do not have souls, and are unaffected by the spells raise dead or resurrection).  If no such character is available in the party, as will be the case for most low-level parties, the group may choose to approach a NPC High Priest for assistance in raising a dead character. The NPC will always charge a fee for such a casting, typically at least 1,000 gp.

Natural Healing 

A character will recover 1 hit point per day of uninterrupted rest. However, if the character has a constitution penalty to hp, before rest will begin to affect the character’s hp the character must rest for a number of days equal to the constitution penalty. A character with high constitution gains a commensurate benefit after resting for one week; the number of hp regained during the second week will be increased by the amount of the character’s hp bonus at the start of the week. Four weeks of rest will return any character to full hp regardless of how many hp the character has lost.