Lightless Litheness Feat 5
Source Pathfinder Lost Omens: Ancestry Guide
Your body is almost as flexible as your shadow. When you critically fail at Squeezing, you get a failure instead. Additionally, when you roll a success at an Escape check, you get a critical success instead; if you roll a critical success, you can Step instead of Striding up to 5 feet.
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.
FetchlingA creature with this trait is a member of the fetchling ancestry. Fetchlings were once human, but generations of life on the Shadow Plane have transformed them.