Cave Mimic

Family: Mimic

Gargantuan monstrosity (shapechanger), neutral

Armor Class 13 (natural armor)
Hit Points 174 (12d20 + 48)
Speed 10 ft., burrow 20 ft.

20 (+5) 8 (–1) 18 (+4) 5 (–3) 13 (+1) 10 (+0)

Skills Perception +4
Damage Immunities acid Condition Immunities prone
Senses darkvision 60 ft., tremorsense 60 ft., passive Perception 14
Challenge 7 (2,900 XP)
Proficiency Bonus +3


  • Adhesive (Object or Terrain Form Only). The mimic adheres to anything that touches it. A creature adhered to the cave mimic is also grappled by it (escape DC 15). Ability checks made to escape this grapple have disadvantage. It can choose for a creature to not be affected by this trait.
  • False Appearance (Object or Terrain Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object or terrain feature.
  • Grappler. The mimic has advantage on attack rolls against any creature grappled by it.
  • Object Mimicry (Object or Terrain Form Only). The mimic can shape minor pseudopods into Medium or smaller objects. A creature that sees such an object can tell it is an imitation with a successful DC 15 Wisdom (Insight) check. A creature with at least half its body in contact with the object, such as sitting on an imitation chair, is subjected to the mimic’s Adhesive trait.
  • Stretched Form (Terrain Form Only). The mimic can occupy another creature’s space and vice versa.
  • Tunneler. The cave mimic can burrow through solid rock at half its burrow speed and leaves a 15-foot-diameter tunnel in its wake.


  • Multiattack. The cave mimic makes four Pseudopod attacks.
  • Pseudopod. Melee Weapon Attack: +8 to hit, reach 15 ft., one target. Hit: 10 (1d10 + 5) bludgeoning damage. If the cave mimic is in object or terrain form, the target is subjected to the mimic’s Adhesive trait.
  • Stalagteeth (Terrain Form Only, Recharge 4–6). The cave mimic launches a harpoon-like pseudopod, shaped like a stalactite or other similarly pointed object, at one creature in its space. The target must succeed on a DC 14 Dexterity saving throw or take 24 (7d6) piercing damage and have the harpoon pseudopod stuck in it. While the pseudopod is stuck, the target is restrained and takes 10 (3d6) acid damage at the start of each of its turns, and the mimic can use a bonus action to pull the target up to 30 feet toward the mimic’s nearest wall, ceiling, or similar surface. A creature, including the target, can take its action to detach the harpoon pseudopod by succeeding on a DC 15 Strength check. If the target detaches the harpoon while it is stuck to the ceiling of the mimic, the target takes falling damage as normal.


  • Change Shape. The cave mimic transforms into a Gargantuan object or stretches itself out as terrain no larger than a 35-foot cube or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.
Section 15: Copyright Notice

Tome of Beasts 3 © 2022 Open Design LLC; Authors: Eytan Bernstein, Celeste Conowitch, Benjamin L. Eastman, Robert Fairbanks, Scott Gable, Basheer Ghouse, Richard Green, Jeremy Hochhalter, Jeff Lee, Christopher Lockey, Sarah Madsen, Ben Mcfarland, Jonathan Miley, Kelly Pawlik, Sebastian Rombach, Chelsea Steverson, Brian Suskind, Mike Welham

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