18 (natural armor)
95 (10d12 + 30)
20 ft., swim 40 ft.
Perception +5
cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks
poison
poisoned
darkvision 120 ft.
Abyssal, telepathy 120 ft.
6
The demon can breathe air and water.
The demon has advantage on Dexterity (Stealth) checks made to hide in swampy terrain.
The demon makes one bite attack and one tail attack.
Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 9 (1d10 + 4) piercing damage and 7 (2d6) poison damage.
Melee Weapon Attack: +7 to hit, reach 15 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage and 7 (2d6) poison damage.
The demon calls out loudly and any creatures in a 90-foot cone must make a DC 15 Constitution saving throw or take 10 (3d6) force damage and be deafened for 1 minute.