Great Old One
Cthulhu has Advantage on saving throws against spells and magical effects. It does not need to breathe, and it can breathe air and water.
Cthulhu
Cthulhu 5e reference with CR 30, type, stat block details, token resources, terrain tools, fear hooks, and monster hunt generation.
CR 30AberrationLegendaryStat Block + PDFHunt Ready
Original 5e-Compatible Stat BlockDownload PDF
Overview
Cthulhu is a gargantuan aberrant Great Old One, a tolerance level 2 mythos boss built for cosmic dread, mind-breaking presence, and world-ending pressure.
Quick 5e Answer
Cthulhu CR, type, stat block, and table tools
Cthulhu is a CR 30 aberration for D&D 5e. This page includes AC 24, HP 676 (33d20 + 330), a ready stat block, a downloadable PDF, and connected encounter tools.
CR30
TypeAberration
Stat BlockOriginal 5e-Compatible Stat Block
PDF SheetAvailable
AC24
HP676 (33d20 + 330)
Original 5e-Compatible Stat Block
Cthulhu
Gargantuan, Aberration (Great Old One), Chaotic Evil
Original 5e5e-compatiblemonster-almanac-original-v1PDF Ready
This is an original Monster Almanac 5e-compatible stat block, not an official SRD stat block.
Armor Class24
Hit Points676 (33d20 + 330)
Challenge30 • 155,000 XP
Proficiency+9
- Speed
- Fly 100 ft., Swim 100 ft., Walk 50 ft.
- Initiative
- +3
- Saving Throws
- Cha +19, Con +19, Dex +12, Int +18, Str +19, Wis +17
- Skills
- Arcana +18, Insight +17, Perception +17, Intimidation +19
- Damage Resistances
- Acid, Cold, Fire, Lightning, Necrotic, Psychic; Bludgeoning, Piercing, Slashing from nonmagical attacks
- Damage Immunities
- Poison
- Condition Immunities
- Charmed, Frightened, Poisoned, Prone
- Senses
- Truesight 120 ft., Blindsight 120 ft.; Passive Perception 27
- Passive Perception
- 27
- Languages
- Deep Speech, telepathy 240 ft.
STR30+10
DEX16+3
CON30+10
INT28+9
WIS26+8
CHA30+10
Traits
Impossible Geometry
Creatures of Cthulhu's choice within 30 feet treat the area as difficult terrain as angles, distance, and gravity bend around it.
Maddening Presence
A hostile creature that starts its turn within 60 feet of Cthulhu and can see or hear it must succeed on a Wisdom saving throw or have Disadvantage on attack rolls and ability checks until the start of its next turn.
Titanic Siege
Cthulhu deals double damage to objects and structures.
Actions
Multiattack
Cthulhu makes three attacks: one Tentacle Maw attack and two Eldritch Claw attacks.
Tentacle Maw
Melee Attack Roll: +19, reach 30 ft. Hit: 49 (6d12 + 10) Bludgeoning damage plus 45 (10d8) Psychic damage. If the target is Huge or smaller, it is Grappled.
Eldritch Claw
Melee Attack Roll: +19, reach 20 ft. Hit: 37 (6d8 + 10) Slashing damage plus 27 (6d8) Necrotic damage.
Drowned Star Pulse
Ranged Spell Attack: +19, range 240 ft. Hit: 54 (8d10 + 10) Psychic or Force damage, Cthulhu's choice.
Call of R'lyeh (Recharge 5-6)
Wisdom Saving Throw: creatures of Cthulhu's choice within 120 feet. Failure: 180 (40d8) Psychic damage, and the target is Stunned until the end of its next turn. Success: Half damage and no Stunned condition.
Bonus Actions
Non-Euclidean Step
Cthulhu teleports up to 90 feet to an unoccupied space it can see in water, mist, darkness, ruins, or alien geometry.
Reactions
Mind-Shattering Retort
When a creature within 120 feet succeeds on a saving throw against Cthulhu, that creature takes 27 (6d8) Psychic damage.
Legendary Actions
Tentacle Sweep
Cthulhu makes one Eldritch Claw attack or one Tentacle Maw attack.
Warp the Angles
Cthulhu moves up to half its Speed or teleports up to 30 feet without provoking Opportunity Attacks.
Star-Drowned Thought
One creature Cthulhu can see within 120 feet must succeed on an Intelligence saving throw or take 27 (6d8) Psychic damage and be unable to take Reactions until the end of its next turn.
Generate Terrain
Coastal
Base + optional customizer
Morning • Clear • Sandy Beach • Low Tide • Shipwreck
Extraplanar
Base + optional customizer
Morning • Planar Instability • Warped Paths • Arcane Storm Lines • Planar Anchor
Ruins
Base + optional customizer
Morning • Clear • Scattered Walls • Rubble Fields • Fallen Statue
Note: These resource links work best when you are logged in to ChatGPT in your browser.
Cthulhu Token, Portrait, Chatbot, Terrain, Fear Hooks, Hunt Generator, and D&D 5e Resources
Cthulhu 5e reference: CR 30 aberration, AC 24, HP 676 (33d20 + 330), PDF sheet, token, portrait, terrain, fear hooks, and hunt tools for Ocean, Coastal,… This page is part of the complete Monster Almanac stat block library. It includes a original 5e-compatible stat block with a downloadable PDF sheet, plus connected prep tools. Use this Monster Almanac page to move from search result to table prep: read the quick 5e reference, open the stat block, download the PDF when available, generate a token or portrait prompt, build matching terrain, create a monster-bound fear hook, and turn Cthulhu into a focused hunt.
Using Cthulhu in play
Cthulhu can be used in Ocean, Coastal, Extraplanar, Ruins, Space, Dream Realm when you want a CR 30 aberration that helps shape combat pressure, exploration tension, or narrative danger.
Cthulhu is especially strong as a centerpiece threat, boss fight, regional terror, or memorable capstone encounter.
The attached original 5e-compatible stat block gives you a table-ready rules reference, and the PDF button keeps the sheet easy to print or save before the session.
This makes Cthulhu useful not only as a monster reference, but also as a scene-shaping piece for travel danger, dungeon pressure, wilderness discovery, or a stronger narrative threat.
Why this monster is useful
- Fits naturally into Ocean, Coastal, Extraplanar, Ruins, Space, Dream Realm.
- Works as a CR 30 option for encounter building and pacing.
- Connects directly with a stat block, downloadable PDF, portrait, token, chatbot, terrain, fear hook, and hunt resources.
- Helps game masters move from reference to actual tabletop use more quickly.
Quick ideas for scene building
- Use Cthulhu as a wandering threat tied to the local environment.
- Pair the monster with terrain from the environments shown above.
- Add an NPC witness, hunter, scholar, survivor, or fearful character to frame the danger.
- Open the chatbot resource to give the creature more roleplay or lore flavor.
- Use the hunt generator to turn this monster into a focused adventure hook.
Cthulhu 5e quick FAQ
What CR is Cthulhu in D&D 5e?
Cthulhu is listed in Monster Almanac as a CR 30 aberration.
What type of monster is Cthulhu?
Cthulhu is listed as a aberration.
Does Cthulhu have a 5e stat block?
Yes. This page includes a original 5e-compatible stat block and a downloadable PDF sheet.
Can I generate a token or hunt for Cthulhu?
Yes. This page links to Cthulhu token, portrait, chatbot, terrain, fear hook, and monster hunt tools for fast D&D prep.
Continue building the scene
After choosing Cthulhu, the next step is usually to connect the monster with a place, an encounter shape, a supporting cast, or a character who fears it. Use the tools below to keep building without leaving the Monster Almanac workflow.