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 creature adhered to the mimic is also grappled by it (escape DC 16). 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. Siege Monster. The mimic deals double damage to objects and structures.
Multiattack. The mimic makes three attacks, one with its bite and two with its pseudopods. It can use its Swallow instead of its bite. Pseudopod. Melee Weapon Attack: +8 to hit, reach 20 ft., one target. Hit: 15 (2d10 + 4) 2d10+4 bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait. Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) 2d10+4 piercing damage plus 9 (2d8) 2d8 acid damage. Swallow. The mimic makes one bite attack against a Large or smaller target it is grappling. If the attack hits, the target is also swallowed, and the grapple ends. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the mimic, and it takes 14 (4d6) acid damage at the start of each of the mimic's turns. The mimic can have only one creature swallowed at a time. If the mimic takes 25 damage or more on a single turn from the swallowed creature, the mimic must succeed on a DC 16 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 10 ft. of the mimic. If the mimic dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 15 ft. of movement, exiting prone.