Colossal Octo (5e Creature)

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Colossal Octo[edit]

Gargantuan monstrosity, unaligned

Armor Class 12 (natural armor)
Hit Points 290 (20d20 + 80)
Speed 20 ft., swim 80 ft.

24 (+7) 8 (-1) 18 (+4) 3 (-4) 14 (+2) 8 (-1)

Saving Throws Str +12, Con +9, Wis +7, Cha +4
Skills Intimidation +4, Perception +7
Damage Resistances acid, cold, fire
Senses darkvision 120 ft., passive Perception 17
Challenge 14 (11,500 XP)

Amphibious. The octo can breathe air and water.

Siege Monster. The octo deals double damage to objects and structures.

Weak Point. The octo takes double damage from a bludgeoning, piercing, or slashing attack that specifically strikes one of its large eyes. Making a called shot against one of its eyes normally imposes disadvantage on the attack roll.

Whirlpool. If the octo surfaces in a lake, ocean, or other suitable large pool of fluid, it creates a whirlpool on the surface of the water out to a radius of 120 feet, which restricts the movement of creatures and vehicles unable to fly or otherwise escape. While in this whirlpool, a creature or vehicle must expend 20 feet of movement to move 1 foot. A creature or vehicle that ends its turn in this whirlpool is pulled 5 feet closer to the colossal octo at the end of its turn. The whirlpool persists until the octo moves from the position in which it surfaced, or it dies.

Underwater Camouflage. The octo has advantage on Dexterity (Stealth) checks made while underwater.


Multiattack. The octo makes a combination of any three tentacle or spit rock attacks. It can substitute one of these attacks with swallow.

Swallow. Melee Weapon Attack: +12 to hit, reach 5 ft., one Large or smaller target. Hit: 18 (4d8) acid damage. The target is grappled (escape DC 19) and swallowed. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the octo, and it takes 18 (4d8) acid damage at the start of each of the octo's turns. The octo can have several targets swallowed simultaneously: one Huge target, two Large targets, four Medium targets, or eight Small or smaller targets—or any appropriate combination thereof. If the octo dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 20 feet of movement, exiting prone.

Tentacle. Melee Weapon Attack: +12 to hit, reach 20 ft., one target. Hit: 29 (4d10 + 7) bludgeoning damage.

Spit Rock. Ranged Weapon Attack: +4 to hit, range 150/600 ft., one target. Hit: 21 (4d10 - 1) bludgeoning damage.

Spit Up. The octo spits any number of targets it has swallowed a distance of up to 600 feet. The spit targets each take either 21 (4d10 - 1) bludgeoning damage, or falling damage appropriate to the distance fallen, whichever is greater. The creature lands prone unless it avoided this damage. As part of this action, the octo can treat the swallowed creature as the projectile used in its spit rock attack—a hit target takes damage from spit rock as normal.

A colossal octo can easily dwarf small ships. Source

Terrors of the deep sea, colossal octos earn their title by being as huge as galleons. One of these monsters is so incredibly huge and powerful that the whirlpool left in its wake can sink a ship—without the octo even attempting to attack it directly.

Like its octorok cousins, a colossal octo is omnivorous. It spends almost all its time eating to support its massive frame, devouring any form of animal or plant it finds underwater. One of these terrifying creatures will usually only surface when underwater food is scarce. It is known to snap birds out of the sky, devouring them whole. One has been known to devour a ship whole, thinking it to be a fish, only to spit the vessel hundreds of yards away just because it didn't like the taste of the vessel's wood.


See also[edit]

  • Big Octo, a smaller and more amphibious relative of this creature
  • Deep Python, another Gargantuan monstrosity that dwells in ocean depths
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