Two Heads. The two-headed plesiosaurus has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious.
Hold Breath. The plesiosaurus can hold its breath for 1 hour.
Multiattack. The two-headed plesiosaurus makes two bite attacks.
Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit:14 (3d6 + 4) piercing damage.
A two-headed plesiosaurus is a marine dinosaur whose compact body is driven by powerful flippers. Predatory and aggressive, it attacks any creature it encounters. Its flexible necks account for a third of its total length, letting it twist in any direction to deliver a powerful bite.