Dire Viper

Large beast, unaligned

Armor Class 14
Hit Points 45 (6d10 + 12)
Speed 40 ft., swim 40 ft.

Skills Perception +3
Senses passive Perception 13
Languages —
Challenge 3 (700 XP)                              Proficiency Bonus +3

Actions

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) piercing damage, and the target must make a DC 13 Constitution saving throw, taking 18 (4d8) poison damage on a failed save, or half as much on a successful one.