Deadly Refrain

You play an invigorating if dissonant refrain that reinforces a sense of power and savagery in your allies. Choose up to 6 creatures that can hear you within a 60-foot-radius. Provided they remain within range and can hear you, for the duration of this spell they deal an additional weapon damage die when they hit with a weapon attack, or an additional two damage die when they critically hit.

You must use your action on each of your turns to maintain concentration on this spell. Using your action for anything else ends the spell.