Hold Breath. The plesiosaurus can hold its breath for 1 hour.
Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) piercing damage.
This predatory marine reptile and cousin to the dinosaurs attacks any creature it encounters. Its long, flexible neck lets it twist in any direction to deliver a powerful bite.