Mi-Go Warrior

Family: Mi-Go

This hideous crustaceous creature possesses multiple jointed limbs extending from its carapace and folded, fanlike wings. Its head is a brainy protuberance covered with tiny bristles that constantly cycle through a nauseating array of clashing colors.

Large plant, neutral evil

Armor Class 18 (natural armor)

Hit Points 151 (14d10 + 56)

Speed 30 ft., fly 20 ft.

20 (+5) 18 (+4) 19 (+4) 21 (+5) 17 (+3) 16 (+3)

Damage Resistances fire

Damage Immunities cold

Senses blindsight 30 ft., darkvision 60 ft., passive Perception 13

Languages Aklo, Common, Mi-Go

Challenge 8 (3,900 XP)

Special Traits

  • Basic Star Travel. The mi-go can fly through space at great speeds. Travel times vary, but it can generally arrive within the same solar system in 3d20 months, or to another star system within 3d20 years.
  • Unbreathing. The mi-go doesn’t need to breathe.


  • Multiattack. The mi-go warrior makes three attacks: two with its pincers and one with its claws.
  • Claws. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.
  • Pincer. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage. If the target is Medium or smaller, it is grappled (escape DC 15). Until this grapple ends, the creature is restrained, and the mi-go warrior can’t attack another target with that pincer.
  • Evisceration. Melee Weapon Attack: +9 to hit, reach 5 ft., one target creature grappled by the mi-go. Hit: 41 (8d8 + 5) slashing damage and one of the target’s ability scores of the warrior’s choice is reduced by 1d4 until it finishes a long rest. If the target’s ability score is reduced to 0, it dies and the warrior can extract the target’s brain intact.


  • Spore Burst. When the mi-go warrior takes bludgeoning, piercing, or slashing damage, it releases a burst of acid spores. Each non-plant creature within 5 feet of the mi-go must make a DC 16 Dexterity saving throw, taking 7 (2d6) acid damage on a failure, or half as much damage on a success. The creature that dealt the damage that released the spores automatically fails its saving throw.


Mi-go, commonly called the fungi from Yuggoth, are mainly fungoid in nature, but externally they have many features in common with crustaceans, such as multiple jointed limbs and a carapace. Folded against their bodies when not in use, their fan-like wings allow them to fly rapidly through space or clumsily in an atmosphere, and their heads are brain-like excrescences covered with small bristles which can change color for communication.

Mi-go develop custom spores and fruiting bodies, thus giving rise to endless varieties of their species. There are some mi-go whose hyphae grasp and feed from the very universe and the void of space itself, though most use these filaments to feed on animals and minerals. Their hyphae can sting and induce madness as they eat prey.

Most mi-go modify themselves surgically, magically, and genetically. Some are little more than gigantic brains while others are heavily-armored mi-go warriors. Adventurers typically encounter mi-go scouts, who are by no means the most advanced of their kind.

Masters of Technology. These highly intelligent creatures have advanced knowledge and skill in chemical and biological processes. Their brain cylinders and sensory machines are common examples of the many wonders they can create. As such, it is difficult to prepare for and know what to expect when encountering the mi-go. One could wield a new weapon a mi-go scientist developed to kill a specific person, which it does with unnerving efficiency. Another could spread madness-inducing spores modeled after the mi-go’s own hyphae.

Section 15: Copyright Notice

Sandy Petersen's Cthulhu Mythos, © 2018, Petersen Games; Authors: Sandy Petersen, David N. Ross, James Jacobs, Arthur Petersen, Ian Starcher.

This is not the complete section 15 entry - see the full license for this page