5e SRD >Creatures >

Mu Spore

Gargantuan, plant, chaotic neutral

Armor Class 21 (natural armor)
Hit Points 444 (24d20+192)
Speed 40 ft., fly 30 ft.

26 (+8) 9 (�1) 27 (+8) 18 (+4) 24 (+7) 27 (+8)

Saving Throws Con +15
Damage Resistances piercing, slashing
Damage Immunities acid, poison
Skills Arcana +11, Medicine +14, Nature +11
Senses blindsight 240 ft., low-light vision, passive Perception 17
Languages Common, Deep Speech, Terran, Deep Speech
Challenge 21 (30,000XP)

Special Traits

  • Grasping Tendrils. Sticky arm-length tendrils cover a mu spore. When an adjacent creature hits the mu spore with a melee attack, the mu spore can use these tendrils to attempt to grapple that creature as a reaction. The mu spore makes an attack roll with a +15 bonus, and on a successful hit, the attacker becomes grappled (escape DC 20) and restrained until the grapple ends.


  • Multiattack. The mu spore makes one bite attack or swallow attack, and up to two constrict attacks.
  • Bite. Melee Weapon Attack: +15 to hit, reach 5 ft., one target. Hit: 29 (6d6+8) piercing damage and 21 (6d6) acid damage.
  • Constrict. Melee Weapon Attack: +15 to hit, reach 10 ft., one Huge or smaller creature. Hit: 41 (6d10+8) bludgeoning damage. The target is grappled (escape DC 20) and restrained until this grapple ends.
  • Spore Cough (Recharge 4-6). A mu spore can release a cloud of burrowing spores in a 120-foot cone. The burrowing spores deal 110 (20d10) necrotic damage to all creatures and wooden structures in the area, or half damage to any creatures that succeed on a DC 16 Dexterity saving throw. Plants and plant creatures are immune to this damage.
  • Swallow. The mu spore makes one bite attack against a Huge or smaller target it is grappling. If the attack hits, the target is also swallowed, and the grapple ends. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the mu spore, and it takes 90 (20d8) acid damage at the start of each of the mu spore�s turns. A mu spore can have only one creature swallowed at a time. If the mu spore takes 40 damage or more on a single turn from the swallowed creature, the mu spore must succeed on a DC 25 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 10 feet of the mu spore. If the mu spore dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 15 feet of movement, exiting prone.


A mu spore is a thankfully rare plant of vast power and strange intellect. The smallest of mu spores (such as the one presented here) are never less than a hundred feet long from tentacle tip to tentacle tip and weigh a minimum of 200,000 pounds. They are covered in tentacles and eyes, with a vast mouth opening like a toothy cavern. Yet despite their vast bulk, mu spores are capable of flying with an uncommon grace, venting jets of foul-smelling spores to guide their flight through the air or even though space, able to hold their breath for long periods when flying through the void.

Immensity. Mu spores dwell in vast caverns, but sometimes drift up to the surface through immense pits or tunnels�they have no fear of sunlight but prefer nocturnal habits. Mu spores are more than just ravenous eaters of nations�they possess uncommon intellects, and if peaceful contact can be made, their knowledge can be quite valuable. Even more valuable, to many debased alchemists, are the strange secretions and spores they emit, for these rare materials can be brewed into the strangest of drugs and elixirs.

Section 15: Copyright Notice
Mythos Monsters (5E) © 2020, Legendary Games; Authors Michael "solomani" Mifsud, Robert J. Grady, Mark Hart, Jeff Ibach, Alex Riggs, Scott D. Young, Jeff Lee, Matt Kimmel, and Jason Nelson.