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PFS StandardOverwhelming Blow [three-actions] Feat 16

Fighter 
Source Player Core pg. 150 2.0

You throw your weight into a powerful attack that leaves you vulnerable. Make a melee Strike. This counts as three attacks when calculating your multiple attack penalty. If this Strike hits, you get a critical hit. If you roll a critical hit, your weapon or unarmed attack also gains the deadly d12 trait (this replaces any deadly trait it already has). Whether or not you hit, you become stunned 1 and are off-guard until the start of your next turn.