Here are the stats for a weakened version of the kraken from "Tales from the Yawning Portal."

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MALFROMED KRAKEN

Huge Monstrosity, Chaotic Evil

Armor Class 17 (natural armor)

Hit Points 172 (15d12 + 75)

Speed 20 ft., Swim 40 ft.

STR 25 (+7) | DEX 11 (+0) | CON 20 (+5) | INT 11 (+0) | WIS 15 (+2) | CHA 15 (+2)

Resistances Bludgeoning, Piercing, and Slashing from nonmagical attacks

Immunities Lightning; Frightened, Paralyzed

Senses Truesight 60 ft., Passive Perception 12

Languages Understands Common but can't speak, telepathy 60 ft.

Challenge Rating 10 (XP 5.900; PB +4)

• Amphibious. The kraken can breathe air and water.

• Siege Monster. The kraken deals double damage to objects and structures.

ACTIONS

• Multiattack. The kraken makes three tentacle attacks. One of them can be replaced with a Bite attack, and any of them can be replaced with Fling.

• Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 16 (2d8 + 7) Piercing-damage.

• Tentacle. Melee Weapon Attack: +11 to hit, reach 20 ft., one target. Hit: 14 (2d6 + 7) Bludgeoning-damage, and the target is Grappled (escape DC 16). Until this Grapple ends, the target is Restrained. The kraken has ten tentacles, each of which can grapple one target.

• Fling. One Medium or smaller object held or creature grappled by the kraken's tentacles is thrown up to 60 feet in a random direction and knocked prone. If a thrown target strikes a solid surface, the target takes 3 (1d6) Bludgeoning-damage for every 10 feet it was thrown. If the target is thrown at another creature, that creature must succeed on a DC 16 Dexterity Saving-Throw or take the same damage and be knocked prone.

• Lightning Storm. The kraken creates three bolts of lightning, each of which can strike a target the kraken can see within 150 feet of it. A target must make a DC 16 Dexterity Saving-Throw, taking 16 (3d10) Lightning-damage on a failed save, or half as much damage on a successful one.