SFS Standard Hardened in the Vault Feat 1

Source Galactic Ancestries pg. 207
Prerequisites Vorlathi Worlanisi
Your body was forged in the Vault of Vorlath by mercenaries who were subjected to brutal experimentation. You gain the Diehard feat. Once per day, if you fail the flat check to remove persistent damage, you can reroll the check as a free action and take the higher result; this is a fortune effect.

Traits

Worlanisi:A creature with this trait is a member of the worlanisi ancestry. They are small, incredibly lucky, four-armed telepaths with bright blue skin. An ability with this trait can be used or selected only by worlanisis.