Resiliency (Ex)
Source: Advanced Player's Guide, p. 45
You are not disabled and you do not gain the staggered condition if you are reduced to exactly 0 hit points. At 7th level, you gain Diehard as a bonus feat. At 11th level, you do not lose a hit point when you take a standard action while disabled. You do not need to meet the prerequisite to receive the Diehard feat.