At zero hit points, the wounded character hovers on the brink of death. To determine if the character progresses toward death or life, the character must make a Body-Mind-spirit check. A successful roll indicates that the character will live without medical intervention; a failure indicates that the character will slip toward death unless medical intervention is available.
Assuming the check is successful, the character will still remain in a comatose state for 1d4 hours per point of Constitution below 18. If the character’s Constitution is 18 or more, the coma period is simply 1d4 hours. While the character's hit points are at zero of less, he or she cannot be awakened by any mundane means. Once this period is ended, the character awakens with one hit point, and begins recovery according to the rules on positive hit points. Of course, the character is in a weakened state and cannot enter into combat for at 1d4 days.