Necromantic Physiology Feat 5
Source Pathfinder Player Core 2
Your unusual physiology has developed in a way that makes it difficult for parasites and other infestations to prey upon you. You gain a +2 circumstance bonus to saving throws against diseases. If you roll a success on a saving throw against a disease, you get a critical success instead. If you have a different ability that would improve the save in this way (such as the Battle Hardened fighter class feature), if you roll a critical failure on the save you get a failure instead.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
DhampirA creature with this trait has the dhampir versatile heritage. These humanoids are the offspring of vampires and members of other ancestries.