After boarding the boat from the Underdark beach, a boat captained by Corsair Greymon sails up alongside the party's boat. Greymon comes aboard, and the player character has to pass a check to convince him to let the party through to Grymforge. If failing the check, or choosing violence, Greymon attacks and Bonna joins the battle on his side.
Spend 6 m / 20 ft of your movement to deal an additional [Strength modifier]PhysicalDRS damage (minimum 1) on each successful weapon attack for the rest of the turn.