Bitey

Shapechanger. Bitey can use its action to polymorph into an object or back into its true, chest 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. Bitey adheres to anything that touches it. A Huge or smaller creature adhered to Bitey is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.

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

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

Stomach of Holding. The inside of Bitey acts similarly to a bag of holding, the differences being that other storage objects such as portable holes and handy haversacks can be placed within it without incident, and that any object placed inside is cleaned and cared for (fabrics will be ironed and folded, metal and leather will be shone, etc). Should Bitey be reduced to 0 hp, it will disgorge the contents of it's stomach before it dies.

Hungry. If Bitey has not been fed for a Tenday he will no longer disgorge objects from his stomach. It will Chew (1d4+1) piercing damage a random object or creature once per day until fed a small or medium sized creature.

Bored. Once during a long rest Bitey will need to be fed or played with or will Ram (1d4 + 2) bludgeoning damage its owner for attention.

Homicidal Loyalty. Bitey knows where its owner is at all times and will take all means necessary to stay within 30ft. of them (unless told to do otherwise); including breaking through doors, walls, fortifications and the barriers between planes of existence. It follows its owners instructions but will also fight to protect its adopted owner with a fiery rage.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 4 (1d8) acid damage.

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Ram. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage. If Bitey has just moved 20ft it deals an additional 1d4 bludgeoning.

Sit. Bitey retracts its legs into its underside. In this state it is indistinguishable from a regular object, even if anybody was to view the underside, however it cannot move from it's current position.

Stand. Bitey brings out its legs and becomes mobile again.

Bite (Object Form Only). If a creature attempts to pry open Bitey, they are grappled and take 7 (1d8 + 3) piercing damage plus 4 (1d8) acid damage.