There is a Legacy version
here.
Silencing Strike [one-action] Feat 10Barbarian Incapacitation Rage Source Player Core 2 pg. 82
A quick strike to the face or mouth silences your opponent. Make a melee Strike against an enemy. If it hits, the enemy must succeed at a Fortitude save against your class DC.
Success The target is unaffected.
Failure The target is dazed and can barely vocalize. It's
stunned 1 and its speech is raspy and hard to understand. It must succeed at a DC 11 flat check to use
linguistic actions or Cast a Spell, unless the spell has the
subtle trait.
Critical Failure As failure, but the creature is stunned 3 instead of stunned 1.
Traits
Incapacitation: An ability with this trait can take a character completely out of the fight or even kill them, and it’s harder to use on a more powerful character. If a spell has the incapacitation trait, any creature of more than twice the spell’s rank treats the result of their check to prevent being incapacitated by the spell as one degree of success better, or the result of any check the spellcaster made to incapacitate them as one degree of success worse. If any other effect has the incapacitation trait, a creature of higher level than the item, creature, or hazard generating the effect gains the same benefits.
Rage: You must be raging to use abilities with the rage trait, and they end automatically when you stop raging.