Plesiosaurus

Large Beast (Dinosaur), Unaligned

AC 13 Initiative +2 (12)
HP 68 (8d10 + 24)
Speed 20 ft., Swim 40 ft.

STR 18 +4 / +4DEX 15 +2 / +2CON 16 +3 / +3INT 2 -4 / -4WIS 12 +1 / +1CHA 5 -3 / -3

Skills Perception +3, Stealth +4
Senses Passive Perception 13
Languages None
CR 2 (XP 450; PB +2)

Hold Breath. The plesiosaurus can hold its breath for 1 hour.

Bite. Melee Attack Roll: +6, reach 10 ft. Hit: 11 (2d6 + 4) Piercing damage.

Source: SRD 5.2.1 · CC-BY-4.0