Resounding Blow Feat 10
Source Pathfinder Advanced Player's Guide
Requirements You are wielding a melee weapon that deals bludgeoning damage.
You strike your enemy in the head with such force that their ears ring. Make a melee Strike. If the Strike hits and deals damage, the target is Deafened until the start of your next turn (or for 1 minute on a critical hit).
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.
BarbarianThis indicates abilities from the barbarian class.
RageYou must be raging to use abilities with the rage trait, and they end automatically when you stop raging.