based on D&D 5th Edition
Gargantuan  Monstrosity Titan, Chaotic Evil

Armor Class 18  (natural)
Hit Points 472  (27d20+189)
Speed 20 ft. , swim 60 ft.

30  (+10) 11  (0) 25  (+7) 22  (+6) 18  (+4) 20  (+5)
Saving Throws Str +18, Dex +8, Con +15, Int +14, Wis +12
Damage Immunities Bludgeoning, Lightning, Piercing, Slashing
Condition Immunities Frightened, Paralyzed, Restrained
Senses truesight, passive Perception 14
Languages Abyssal, Celestial, Infernal, Primordial, Telepathy
Challenge 23  (0 XP)
Siege Monster. Deals double damage to objects and structures..
Freedom of Movement. Ignores difficult terrain, speed cannot be reduced, cannot be restrained. .
Place Tentacle. .
Mutable. Ignores wall terrain, can occupy wall terrain but cannot end its turn entirely in a wall. Can not cross a long wall, but rather flows around walls. Never considered squeezing.
Multiattack. make three tentacle attacks, each can be replaced with one Fling
Bite. Melee Weapon Attack: +18 to hit, reach 5 ft., one target. Hit: 23 (3d8 +10) piercing damage. If the target is grabbed and large or smaller it can be swallowed. While inside blinded, restrained, and total cover from outside attacks. Suffers 42 (12d6) acid damage at start of turn. If damage taken by kraken is 50 or more on a single turn the worm must make a DC 25 Constitution saving throw or regurgitate swallowed creatures.
Tentacle. Melee Weapon Attack: +18 to hit, reach 30 ft., one target. Hit: 20 (3d6+10) bludgeoning damage. Target is grappled, escape DC 18. Restrained. Can grapple up to 10 targets.
Fling. Target can be thrown up to 60 ft in a random direction and knocked prone. Target suffers 3 (1d6) damage for every 10 ft thrown. If thrown at another creature the other creature must make a DC 18 dexterity saving throw or take the same damage. for 3 (1d6) damage
Lightning Storm. 3 bolts of lightning targets that the Kraken can see. Target must make a DC23 Dexterity saving throw or take lightning damage, half damage on a successful save., for 22 (4d10) lightning damage in 120 ft. Ranged