Amphibious. Gyruda can breathe air and water.

Companion. Gyruda can only be bonded to a character who’s base attribute scores are all even numbers and is at level 20.

Ingested Summons. At the beginning of combat as a bonus action Gyruda can spit out creatures that it has consumed in the past to fight alongside it.

Legendary Resistance (3/Day). If Gyruda fails a saving throw, he can choose to succeed instead.

Siege Monster. Gyruda deals double damage to objects and structures.

Multiattack. Gyruda makes three tentacle attacks, each of which it can replace with one use of Fling.

Bite. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 21 (3d8 + 8) piercing damage. If the target is a Large or smaller creature grappled by Gyruda, 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 Gyruda, and it takes 42 (12d6) acid damage at the start of each of Gyruda's turns.

If Gyruda takes 50 damage or more on a single turn from a creature inside it, Gyruda must succeed on a DC 24 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of Gyruda. If Gyruda 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: +14 to hit, reach 60 ft., one target. Hit: 18 (3d6 + 8) bludgeoning damage, and the target is grappled (escape DC 18). Until this grapple ends, the target is restrained. Gyruda has ten tentacles, each of which can grapple one target.

Fling. One Large or smaller object held or creature grappled by Gyruda 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 18 Dexterity saving throw or take the same damage and be knocked prone.

Gyruda can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The kraken regains spent legendary actions at the start of its turn.

Tentacle Attack or Fling. Gyruda makes one tentacle attack or uses its Fling.

Ink Cloud (Costs 3 Actions). While underwater, Gyruda expels an ink cloud in a 60-foot radius. The cloud spreads around corners, and that area is heavily obscured to creatures other than Gyruda. Each creature other than Gyruda that ends its turn there must succeed on a DC 22 Constitution saving throw, taking 16 (3d10) poison damage on a failed save, or half as much damage on a successful one. A strong current disperses the cloud, which otherwise disappears at the end of Gyruda's next turn.