Carousel Mimic

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.

Stunning Slime. The pseudopods of this type of mimic are covered in a slime with stunning properties to make absorbing prey much easier. The creature must make a CON sav DC 15 or be stunned (incapacitated- auto-fail DEX/STR saves) Mimic has advantage

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object. Damage needed: 30

Grappler. The mimic has advantage on attack rolls against any creature grappled by it. DC 15 to break from Grapple 

Sunlight Sensitivity. While in sunlight, the carousel mimic has disadvantage on attack rolls, as well as Wisdom (perception) checks that rely on sight

Immutable Form. This is a special fey mimic that acts as a living construct as well as having multiple living entities being slowly digested. It's form cannot be magically altered

Sacrifice. If enough damage is dealt in one turn, the Carousel Mimic will release a captured creature. Damage needed to be dealt: 40

Regurgitate. If enough damage is dealt while within the creature, it will spit you out. Damage needed to be dealt: 30

Multiattack. The Carousel Mimic makes 3 pseudopod attacks

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 Stunning Slime.

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

Swallow. The Carousel Mimic is a creature of  magical/ trickster Fey magic. It makes one bite attack against a Large creature or smaller that it's grappling. If it hits or the creature fails the Bronze Ring trial, that creature takes the bite's damage and is pulled into the mirrors, the grapple ended, but the creature now blinded and restrained. The victim has total cover against attacks and other effects outside the Carousel.

Slow Digestion. Once swallowed, victims are slowly digested, their faces displayed at the top of the inner ceiling of the carousel structure if they are humanoid; otherwise victims of beastial decent are displayed as part of the rideable attraction, frozen in animated poses, dressed in colorful saddles while taking 2d6 acid damage every round

If a creature leaves its range it takes an opportunity attack, Pseudopod attack

Thematic Expansion. On the third and final failed attempted Dex check at acquiring the bronze ring, the Carousel Mimic uses a pseudopod to pull a grappled individual into one of the mirrors covering the main body

Fleshy Darkness. Beings now trapped inside, see Swallow action, must makes saves to escape while taking 2d6 acid damage at the top of their turns. Small weapons (ie, Daggers) attack normal. Large weapons attack disadvantage (no room to swing). Some spells will cause the user damage as well (up to DM's discretion).

Playing with Food. The carousel Mimic can shift the many beasts to act as a shield, raising its AC by the the STR modifier of the creature it places in front of the attack. Creature selected is either whichever creature is closest to the attacker, or roll a d10 (or whatever number of creatures are on the Carousel). AC is raised until the top of its next turn

Attack with Pseudopod