Cthulhu

  Immortal nature Cthulhu  does not need to breathe eat or sleep

Palingenesis. When Cthulhu is reduced to 0 hit points or killed, only his physical shell is destroyed.

Death Throes. When Cthulhu dies, it explodes, and each creature within 5 miles  of it must make a DC 25 Dexterity saving throw, taking 50 (5d10)    Thunder damage on a failed save, or half as much damage on a successful one. 

 Release the  Kraken. As a bonus action  Cthulhu  summons one kraken  which will be summoned into space within a mile of it Cthulhu  can't use this again until it finishes a long rest   

call of Cthulhu. As a bonus action  Cthulhu can summon a amount of aberration,s  Who's total  maximum hit points do not exceed 500 as an action  it cannot do this again  until it finishes a long rest

Immutable Form. Cthulhu  is immune to any spell or effect that would alter its form unless it chooses to be affected 

Magic Weapons. Cthulhus weapon attacks are magical.

Spellcasting. Cthulhu is a 21st level spellcaster. His spellcasting ability is Intelligence (spell save DC 23, +14 to hit with spell attacks). Cthulhu the Risen has the following spells prepared.

Cantrips (At-Will):  [Tooltip Not Found] Shape Water, Thaumaturgy

1st Level Spells (7 Slots): Detect Magic Magic Missile, Shield

2nd Level Spells (6 Slots): Blindness/Deafness, Darkness, Hold Person, [/spell] Levitate.

3rd Level Spells (5 Slots): Blink, Counterspell, Fireball, Wall of Water

4th Level Spells (5 Slots): Dimension Door, Evard's Black Tentacles, Greater Invisibility, Watery Sphere

5th Level Spells (5 Slots): Bigby's Hand, Contact Other Plane, Hold Monster, [Tooltip Not Found]

6th Level Spells (4 Slots): Disintegrate True Seeing

7th Level Spells (3 Slots): Finger of Death, Teleport, Whirlwind

8th Level Spells (2 Slots): Antimagic Field, Control Weather, Feeblemind, Power Word Stun, Tsunami

9th Level Spells (1 slot): Meteor Swarm, Storm of Vengeance, Wish

  Unnerving  Aura  creatures within 1500 feet of Cthulhu  must make a dc25 wisdom saving throw  or have disadvantage  on all rolls for 24 hours 

Aberrant Awareness. Cthulhu knows if it hears a lie.

Reflective Carapace. Any time Cthulhu  is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack roll, roll a d12 On a 1 to 11 Cthulhu is unaffected. On a 12, cthulhu is unaffected, and the effect is reflected back at the caster as though it originated from cthulhu, turning the caster into the target.

Regeneration. Cthulhu regains 25 hit points at the start of its turn. If Cthulhu  takes radiant damage, this trait doesn’t function at the start of Cthulhu,s next turn. Cthulhu dies only if it starts its turn with 0 hit points and doesn’t regenerate. 

 Unatural health  (recharges 5-6)  Cthulhu may use as many hit dice as it wants as a bonus action

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

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

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

Mucous Cloud. While underwater, cthulhu is surrounded by transformative mucus. A creature that touches cthulhu or that hits it with a melee attack while within 5 feet of it must make a DC 25 Constitution saving throw. On a failure, the creature is diseased for 1d4 hours. The diseased creature can breathe only underwater.

Probing Telepathy. If a creature communicates telepathically with cthulhu, cthulhu learns the creature's greatest desires if Cthulhu  can see the creature.

Multiattack. Cthulhu makes five attack or casts five spells or any combination of spells and attacks that in total adds up to five 

Sword of Cthulhu. Melee Weapon Attack: +15 to hit, reach 40ft., one target. *Hit* 4d12+10 magical slashing damage, and the target must succeed a DC 25 Constitution saving throw or have disadvantage on all Strength, Dexterity, and Constitution saving throws for 1 minute.

Tentacle. Melee Weapon Attack: +15 to hit, reach 25ft., one target. Hit: 55 (5d10 + 5) bludgeoning damage. If the target is a creature, it must succeed on a DC 25 Constitution saving throw or become diseased. The disease has no effect for 1 minute and can be removed by any magic that cures disease. After 1 minute, the diseased creature's skin becomes translucent and slimy, the creature can't regain hit points unless it is underwater, and the disease can be removed only by heal or another disease-curing spell of 6th level or higher. When the creature is outside a body of water, it takes 6 (1d12) acid damage every 10 minutes unless moisture is applied to the skin before 10 minutes have passed  Additionally  If the target is a creature, it is grappled (escape DC 25). 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.

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.

Wing. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 32 (3d10 + 5) bludgeoning damage. The target has to succeed on a DC 25 Strength check or will be knocked prone.

Acid Breath (Recharge 5–6). Cthulhu  exhales acid in a 300-foot line that is 100 feet wide. Each creature in that line must make a DC 25 Dexterity saving throw, taking 55 (5d10+5) acid damage on a failed save, or half as much damage on a successful one.

Claw. Melee Weapon Attack: +19 to hit, reach 30 ft., one target. Hit: 28 (4d8 + 10) slashing damage.

Frightful Presence. Each creature of Cthulhu ’s choice within 150 feet of it and aware of it must succeed on a DC 25 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the Cthulhu is within line of sight, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to Cthulhus Frightful Presence for the next 24 hours.

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 30 (3d10) 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 30 (3d10) 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 5–6). Cthulhu magically emits psychic energy. Creatures of Cthulhu’s choice within 150 feet of it must succeed on a DC 25 Intelligence saving throw or take 32 (5d10 + 5) psychic damage and be stunned for 1 minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Tail. Melee Weapon Attack: +15 to hit, reach 30ft. one target. Hit: 24 (4d6 + 10) bludgeoning damage.

Enslave (3/Day). cthulhu targets one creature it can see within 30 feet of it. The target must succeed on a DC 25 Wisdom saving throw or be magically charmed by cthulhu until cthulhu dies  The charmed target is under Cthulhus control and can't take reactions, and cthulhu and the target can communicate telepathically with each other over any distance.

Whenever the charmed target takes damage, the target can repeat the saving throw. On a success, the effect ends. No more than once every 24 hours, the target can also repeat the saving throw when it is at least 100 miles away from Cthulhu.

Cthulhu 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 aboleth regains spent legendary actions at the start of its turn.

Detect. .cthulhu makes a Wisdom (Perception) check.

Tail Swipe. chulhu makes one tail attack.

Psychic Drain (Costs 2 Actions). One creature charmed by Cthulhu takes 10 (3d6) psychic damage, and Cthulhu regains hit points equal to the damage the creature takes.