Your grand destiny allows you to avoid death.
Prerequisites: Human or half-human, Heroic Destiny, character level 6th.
Benefit: Once per day, any effect that would reduce you to –10 hit points or fewer instead reduces you to –9 hit points and leaves you in a stable condition.
Effects that kill you without reducing you to –10 hit points (such as death effects or disintegrate) function normally.
Source: Races of Destiny, page 152.