Irrepressible (Halfling) Feat 9
Source Pathfinder Core Rulebook
You are easily able to ward off attempts to play on your fears and emotions. When you roll a success on a saving throw against an emotion effect, you get a critical success instead. If your heritage is gutsy halfling, when you roll a critical failure on a saving throw against an emotion effect, 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.
HalflingA creature with this trait is a member of the halfling ancestry. These small people are friendly wanderers considered to be lucky. An ability with this trait can be used or selected only by halflings. A weapon with this trait is created and used by halflings.