Large Elemental, neutral
Armor Class 14 (natural armor)
Hit Points 93 (11d10+33)
Speed swim +50, walk +40
Challenge 4
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained, unconscious
Senses darkvision 60 ft., passive Perception 10
Languages understands Primordial but can't speak
Liquid Form. The elemental can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.
Underwater Camouflage. The elemental has advantage on Dexterity (Stealth) checks made while underwater.
Multiattack. The venom elemental makes two bite attacks.
Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., one creature. Hit: 6 (1d6 + 3) piercing damage plus 7 (2d6) poison damage, and the creature must succeed on a DC 13 Constitution saving throw or be poisoned until the end of its next turn.
Source: Creature Codex · OGL/Open