Lab Rat Feat 5
Source Pathfinder Player Core 2
You've spent more than your share of time in an alchemy lab. You have been exposed to a wide variety of alchemical poisons and harmful substances, leaving you with an increased tolerance of their effects. You have a +1 circumstance bonus to saves against poisons and diseases. If you roll a success on your saving throw against a poison or disease, you get a critical success 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.
RatfolkA creature with this trait is a member of the ratfolk ancestry. Ratfolk are humanoids who resemble rats.