Life Mystery

Upon reaching 20th level, you become a perfect channel for life energy. You become immune to bleed, death attacks, exhaustion, fatigue, nausea effects, negative levels, and sickened effects. Ability damage and drain cannot reduce you below 1 in any ability score. You automatically make saving throws against massive damage. When you are below 0 hit points, you do not die until your negative total is in excess of twice your Constitution score.