Cthulhu (5e Creature)

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Design Note: This creature was designed using Mythic Monsters (5e Variant Rule) as a guide.

Cthulhu[edit]

Titanic aberration (great old one), chaotic evil


Armor Class 33 (natural armor)
Hit Points 7050 (100d100 + 2000)
Speed 100 ft., fly 600 ft., swim 150 ft.


STR DEX CON INT WIS CHA
45 (+20) 31 (+15) 55 (+25) 50 (+25) 53 (+15) 55 (+25)

Saving Throws Str +29, Dex +22, Con +34, Int +34, Wis +27, Cha +34
Skills all expertise +28
Damage Vulnerabilities radiant
Damage Resistances fire, cold, acid, lightning, force, necrotic, bludgeoning, piercing, and slashing
Damage Immunities necrotic, poison, psychic; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities all
Senses darkvision 120 ft., truesight 120 ft., passive Perception 27
Languages Tongue of the Great Old Ones, Deep Speech, telepathy 640 ft, R'lyehian.
Challenge 50 (1,220,000 XP)


Spellcasting. Cthulhu is a 20th-level spellcaster. His spellcasting ability is Charisma (spell save DC 30, +22 to hit with spell attacks). Cthulhu has all sorcerer spells known and can cast all sorcerer spells 7th level or lower at will and has 6 8th level slots and 2 9th level slots:

Irresistible Offense. All damage done by Cthulhu's bypass all forms of damage resistance and damage immunity.

Eldritch Resistance (10/Day). If Cthulhu fails a saving throw, he can choose to succeed instead.

Non-Euclidean Madness. A creature that starts its turn within 240 feet of Cthulhu must succeed on a DC 32 Wisdom saving throw or gain short term madness for 1 minute. A creature can repeat the saving throw at the end of each of its turns, 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 this ability for the next 24 hours.

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

Regeneration. Cthulhu regains 100 hit points at the start of his turn.

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 attacks are treated as +5 weapons.

ACTIONS

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

Claw. Melee Weapon Attack: +34 to hit, reach 35 ft., one target. Hit: 307 (54d10 + 20) slashing damage.

Tentacles. Melee Weapon Attack: +34 to hit, reach 40 ft., one target. Hit: 246 (43d10 + 20) 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 he is grappling moves with him.

Wing. Melee Weapon Attack: +34 to hit, reach 35 ft., one target. Hit: 252 (44d10 + 20) bludgeoning damage. The target has to succeed on a DC 30 Strength saving throw or be knocked prone.

Otherworldly Gaze. A creature of Cthulhu's choice that is within 300 feet of Cthulhu must make a DC 36 Intelligence saving throw, taking 198 (36d10) psychic damage on a failed save, or half as much damage on a successful one.

Eldritch Howl (Recharge 4-6). Cthulhu emits a soul-splintering howl. Each creature in a 120-foot radius around Cthulhu must make a DC 34 Constitution saving throw, taking 599 (109d10) thunder damage on a failed save, or half as much on a successful one. Each creature also has to make a DC 36 Wisdom saving throw, taking 599 (109d10) psychic damage and be inflicted with a randomly selected long term madness on a failed save, or half as much damage and not gaining a madness on a successful one.


LEGENDARY ACTIONS

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. Cthulhu regains spent legendary actions at the start of his turn.

Attack. Cthulhu makes one claw attack, one wing attack, or one tentacle attack.
Rage (Costs 2 Actions). Cthulhu can use Eldritch Howl if it is recharged. (Must Roll for Recharge on your turn)
Unspeakable Horror (Costs 3 Actions). Cthulhu consumes the soul of an unconscious creature within 120 feet of him that he can see. The creature dies and cannot be resurrected except via a wish spell or until Cthulhu chooses to release its soul or until his physical form is destroyed.

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Great Cthulhu is one of the Great Old Ones, a god-like being asleep somewhere under the ocean. Currently trapped, Cthulhu will eventually awaken, an event subconsciously feared by all sentient races.

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