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.
Acid Breath (4-5 Recharge). The Mimic spits up a sickly green liquid that evaporates into the air creating a pale green cloud of gas in a 15 ft cone. Each creature in the area must make a Dexterity Dc 13 saving throw or take 2d6 acid damage. On a successful save the creature takes half damage.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 4) piercing damage plus 3 (1d6) acid damage.
Claws. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 7 (1d8+4) piercing.
Description
The Anvil Wrought Creation
There is a story shared on the far shores of Theros of a creation of Anvil wrought beasts that even Purphoros dictated that their construction should not be continued. A construct whose purpose lied in protection through deception. But the beasts were flawed and while they typically didnt attack their creators a couple took the protection of their property more to heart than their initial magical programming. As such Purphoros had the remaining condemned to ruins and temples as his followers left them to protect Purphoros' secrets and he destroyed any remaining information about how to create them. All though, some whispers claim not every forge recipe for a mimic of this kind was truly destroyed.
The Mechanical Deceiver
These mechanical deceivers typically appear to be a normal chest when still. Although they have been known to mimic their surroundings and other items roughly their size just as much, it is not uncommon to see these mimics take the form of a anvil, vase, or other such items. However, when provoked, or interacted with, these mechanical beasts whir to life as the gears and pistons that make up their interior 'guts', so to speak, begin to shift forms for the beast. First, its magically infused metal exterior drops the illusion that it has put up of it as a chest. Then it sprouts limbs typically, whether they be a pseudopod of sorts, wheel, arms and legs or some other unholy combination is truly up to the creator, and opens its horrific mouth revealing rows of metallic teeth as well as gears ready to grind up organic material that enters it, stopping and preserving anything of worth in a smaller compartment inside it for the creator to later retrieve. The mechanical beast's design range and differ as each forge master adds their own little creative decision to the design, a signature of sorts, and as such no two anvil wrought mimics are the same. A fact that makes them all the more dangerous to any wandering adventurers.