All In My Head Feat 18
Source Pathfinder Advanced Player's Guide
Trigger You would take damage from a Strike or spell that doesn't have the death trait or otherwise cause instant death (such as Disintegrate).
Using your occult connections and incredible powers of persuasion, you convince yourself that the triggering damage is a figment of your imagination.
The damage changes from its usual damage type to mental damage, and the damaging effect gains the nonlethal trait. You can't use this reaction if you are immune to mental effects or mental damage.
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.
BardThis indicates abilities from the bard class.
IllusionEffects and magic items with this trait are associated with the illusion school of magic, typically involving false sensory stimuli.
MentalA mental effect can alter the target's mind. It has no effect on an object or a mindless creature.