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Precision Attack is a Battle Master Fighter Action. This combat manoeuvre allows the Fighter to increase an attack roll for a higher chance of hitting an opponent.
Your can spend a Superiority Die to add it to a result to an Attack Roll.
Duration: Until Long rest
Affected entity has a bonus to its next weapon Attack Roll equal to its Superiority Die
Classes:
Granted by feats: Martial Adept
Superiority Die + 
freeaction 
Duration: Until Long rest