Gamemastering >Monsters & Foes >Monsters (Alphabetical) >Monsters (D) >

Dune Mimic (3PP)

Huge monstrosity (shapechanger), neutral

Armor Class 13 (natural armor)
Hit Points 168 (16d12 + 64)
Speed 10 ft.

20 (+5) 8 (-1) 18 (+4) 9 (-1) 13 (+1) 10 (+0)

Skills Perception +4
Damage Immunities acid
Condition Immunities prone
Senses darkvision 60 ft., tremorsense 30 ft., passive Perception 14
Challenge 8 (5,900 XP)

Special Traits

  • Shapechanger. The dune mimic can use its action to polymorph into a Huge object or terrain feature (maximum area 25 x 25 feet) or back into its true, amorphous form. Since its coating of dust, sand, and gravel can’t be hidden, it usually disguises itself as a terrain feature or eroded ruin. 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.
  • Adhesive (Object or Terrain Form Only). The dune mimic adheres to anything that touches it. A creature adhered to the dune mimic is also grappled by it (escape DC 15). Ability checks made to escape this grapple have disadvantage. The dune mimic can harden its outer surface, so only the creatures it chooses are affected by this trait.
  • False Appearance (Object or Terrain Form Only). While the dune mimic remains motionless, it is indistinguishable from an ordinary object or terrain feature.
  • Grappler. The dune mimic has advantage on attack rolls against a creature grappled by it.


  • Multiattack. The dune mimic makes four pseudopod attacks.
  • Pseudopod. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage. If the dune mimic is in object or terrain form, the target is subjected to the mimic’s Adhesive trait.
  • Engulf. The dune mimic engulfs all creatures it has grappled. An engulfed creature can’t breathe, is restrained, is no longer grappled, has total cover against attacks and other effects outside the dune mimic, and takes 18 (4d8) acid damage at the start of each of the dune mimic’s turns. When the dune mimic moves, the engulfed creature moves with it. An engulfed creature can try to escape by taking an action to make a DC 15 Strength check. On a success, the creature escapes and enters a space of its choice within 5 feet of the dune mimic.


When a dune mimic strikes, the sand surges and shifts, a sinkhole opens, and sandy tendrils snatch at nearby creatures.


Enormous Forms. Though most commonly seen as dunes, a dune mimic make take the form of a date palm grove, a riverbank, an enormous boulder, or other large shapes in the landscape.

A King’s Guardians. Dune mimics were created by a forgotten king as guardians for his desert tomb. Somewhere, dozens of them guard vast wealth.

Spread by Spores. Although not intended to reproduce, they began producing spores spontaneously and replicating themselves, so that now they’re spread across the deserts. Luckily for the other inhabitants, dune mimics reproduce just once per century.

Section 15: Copyright Notice

Tome of Beasts. Copyright 2016, Open Design; Authors Chris Harris, Dan Dillon, Rodrigo Garcia Carmona, and Wolfgang Baur.