Cthulhu

Amphibious. Cthulhu can breathe in air and water.

Legendary Resistance (3/day). If Cthulhu fails a saving throw, he can choose to succeed on it instead.

Innate Spellcasting. Cthulhu's innate spellcasting ability is Charisma (spell save DC 22). It can cast the following spells, requiring no material components:

At will: dream, plane shift, teleport

Palingenesis. When Cthulhu is reduced to 0 hit points or killed, only his physical shell is destroyed. It will reform at a later point.

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

Magic Resistance. Cthulhu has advantage on saving throws against spells and other magical effects.

Magic Weapons. Cthulhu's weapon attacks are magical.

Multiattack. Cthulhu uses its Otherworldly Gaze. He then makes four attacks: two with his wings and two with his claw, or two with his tentacles and two with his claw.

Action Melee Attack. Claw. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 37 (5d10 + 10) slashing damage.

Tentacles. Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 26 (3d10 + 10) bludgeoning damage. If the target is a creature, it is grappled (escape DC 20). If the target is Huge or smaller, it is also restrained until this grapple ends. While grappling the target, Cthulhu has advantage on attack rolls against it. Cthulhu can grapple a maximum of four creatures at a time. When Cthulhu moves, any Huge or smaller target it is grappling moves with it.

Wing. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 32 (4d10 + 10) bludgeoning damage. The target has to succeed on a DC 20 Strength check or will be knocked prone.

Otherworldly Gaze. A creature of Cthulhu's choice that is within 120 feet of Cthulhu must succeed on a DC 25 Intelligence saving throw, taking 33 (6d10) psychic damage on a failed save, or half as much damage on a successful one.

Eldritch Howl. Cthulhu emits a soul-splintering howl. Each creature in a 60-foot radius around Cthulhu must make a DC 25 Constitution saving throw, taking 33 (6d10) thunder damage on a failed save and being deafened until the end of its next turn, or half as much damage on a successful one. Each creature also has to make a DC 25 Intelligence saving throw, taking 33 (6d10) psychic damage on a failed save, or half as much damage on a successful one. Not being able to hear does not protect against this attack.

Mind Blast (Recharge 6). Cthulhu the Risen magically emits psychic energy in a 100-foot cone. Each creature in that area must succeed on a DC 21 Intelligence saving throw or take 7d8 + 4 psychic damage and be stunned for l minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

As a bonus action Cthulhu can make a "True eye of Cthulhu". For this to work one of his three damage able eyes have to be destoyed. he does this by doing a rebirth chant. This new "True eye of Cthulhu" can use one legendary action per two rounds.

Cthulhu can take 3 legendary actions, choosing from the options below. Only one legendary option can be used at a time and only at the end of another creature's turn. Cthulhu regains spent legendary actions at the beginning of his turn.

Claw (Costs 1 Action). Melee Weapon Attack: +14 to hit, reach 15ft., one target. *Hit* 4d6 + 10 slashing damage.

Recharge (Costs 1 Action; Only usable once per round). Cthulhu can attempt to recharge *Mind Blast* if it is currently uncharged.

Buffeting Wings (Costs 2 Actions). Every creature of large or smaller size within 30 feet of Cthulhu must succeed on a DC 23 Strength check or be pushed 20 ft.