room of doom, version 3

This is the third of three versions of this room.

The room is 35ft. square with the walls and floor made of masonry. There is a 5ft. square stone platform in the middle of the room raised about 6 inches from the floor. A large wooden chest sits in the middle of the raised platform. The room has a high ceiling of about 23ft. There is only one door in this room.

The whole room is a gigantic ancient mimic. The chest is to lure hapless adventurers into the room at which point the “door”, which is its mouth, will close and the mimic will proceed with devouring anyone inside it.

Mimic (Ancient)

Huge monstrosity (shape changer), neutral

  • Armor Class 16 (natural Armour)
  • Hit Points 128 (16d8 + 64)
  • Speed 15ft.

21 (+5) 12 (+1) 18 (+4) 7 (-2) 13 (+1) 8 (-1)

  • Skills Stealth +5
  • Damage Immunities acid
  • Condition Immunities prone
  • Senses darkvision 60ft., passive perception 11
  • Languages
  • Challenge 8 (3900 xp)

Shapechanger. The mimic can use its action to polymorph into an object 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.

Adhesive (Object Form Only). The mimic adheres to anything that touches it. A Huge or smaller creature adhered to the mimic is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object.

Grappler. The mimic has advantage on attack rolls against any creature grappled by it.


Pseudopod. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit : 11 (2d6 + 5) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 5) piercing damage plus 6 (2d6) acid damage.