Medium turned, darkness, aberration,

Armor Class: 16 (Natural Armour)

Hit Points: 93 ( 11d10+33 )

Speed: 30 ft , swim: 30 ft

STR

19 +4

DEX

10 +0

CON

16 +3

INT

5 -3

WIS

11 +0

CHA

5 -3

Skills: Perception +4

Damage Vulnerabilities: Fire

Damage Immunities: Poison

Condition Immunities: Poison

Senses: Darkvision 60ft.

Challenge Rating: 4 ( 1100 XP)

Actions

Multiattack. The chuul makes two pincer attacks. If the chuul is grappling a creature, the chuul can also use its tentacles once.   Pincer. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage. The target is grappled (escape DC 14) if it is a Large or smaller creature and the chuul doesn’t have two other creatures grappled.   Tentacles. One creature grappled by the chuul must succeed on a DC 13 Constitution saving throw or be poisoned for 1 minute. Until this poison ends, the target is paralyzed. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Usual Tactics

The creature fights until death and will not back down. It blindly attacks the closest creature, wether they are friend or foe.