Actions

Tentacle: Melee Weapon Attack: +8 to hit, reach 20 ft., one target. Hit: 2d8+4 bludgeoning damage. If the target is a creature, it is grappled (escape DC 16). Until the grapple ends, the target is restrained, and the kraken can't use the same tentacle on another target.   Bite: Melee Weapon Attack: +8 to hit, reach 10 ft., one target grappled by the kraken. Hit: 3d10+4 piercing damage.   Lightning Surge (Recharge 6): The spectral kraken releases a surge of electrical energy in a 40-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw, taking 8d8 lightning damage on a failed save, or half as much damage on a successful one.   Constrict: The kraken makes one tentacle attack against a grappled creature. If the attack hits, the target takes 2d8+4 bludgeoning damage, and it is stunned until the grapple ends.   Swallow: The kraken makes one bite attack against a Large or smaller target it is grappling. If the attack hits, the target is swallowed, and the grapple ends. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the kraken, and it takes 4d8 acid damage at the start of each of the kraken's turns. If the kraken takes 20 damage or more on a single turn from a creature inside it, the kraken must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate the swallowed creature, which falls 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.