Multiattack

The kraken makes three Tentacle attacks. It can replace one Tentacle attack with a Bite attack.

Bite

_Melee Weapon Attack:_ +17 to hit, reach 5 ft., one target. _Hit:_ 28 (4d8+10) piercing damage. If the target is a Large or smaller creature grappled by the kraken, that creature is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the kraken, and it takes 42 (12d6) acid damage at the start of each of the kraken's turns. If the kraken takes 50 damage or more on a single turn from a creature inside it, the kraken must succeed on a DC 24 CON save at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the kraken. If the kraken dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.

Tentacle

_Melee Weapon Attack:_ +17 to hit, reach 30 ft., one target. _Hit:_ 24 (4d6+10) bludgeoning damage, and the target is grappled (escape DC 22). Until this grapple ends, the target is restrained. The kraken has ten tentacles, each of which can grapple one target.

Ink Cloud (Recharge 6)

While underwater, the kraken expels an ink cloud in a 30-foot-radius centered on the kraken. The cloud spreads around corners, and the area is heavily obscured. Each creature in the area when it first appears must make a DC 22 CON save, taking 110 (20d10) poison damage on a failed save, or half as much damage on a successful one. A creature that enters the ink cloud for the first time on a turn or starts its turn there must succeed on a DC 22 CON save or take 11 (2d10) poison damage and be poisoned until the start of its next turn. The cloud lasts for 1 minute or until dispersed by a strong current.