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 the party is unable to pass the check, or they choose violence, Greymon attacks and Jerris joins the battle on his side.
Normal weapon damage
Your attack summons thorny vines, dealing Weapon Damage and possibly Ensnaring your target.
Ensnared creatures cannot move and take 1d6Piercing damage at the start of each turn. An ally can use their Help Action to try and tear away the vines.