To no one's surprise, this mimic breed is the work of a warlock seeking to roll back the clock as their pact came ever closer to running its course. The foul creation become something beautiful to fit the warlock's carnival tastes and turned out to work, after a fashion. Soon enough, the warlock made gold hand over fist with those anxious to move up and down in age. Of course, debts always come due and the warlock's patron granted the mimic greater intelligence, the ability to spawn progeny, and well, the warlock didn't last long after that. Now, that dark carnival is run by the miscreation with its own, thankfully not terribly nefarious, agenda.

Carousel Mimic

Huge monstrosity (shapechanger), neutral

Armor Class 13 (natural armor)

Hit Points 147 (14d12 + 56)

Speed 15 ft

Str 22 Dex 8 Con 18 Int 16 Wis 15 Cha 18

Skills Stealth +5 Damage Immunities acid

Condition Immunities charmed, prone

Sensesdarkvision 60 ft, passive Perception 12

Languages Common, Elvish, Sylvan

Challenge 6 (2,300 XP)

Shapechanger.

The mimic can use its action to polymorph into a carousel 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 17). Ability checks made to escape this grapple have

False Appearance (Object Form Only)

While the mimic remains motionless, it is indistinguishable from an ordinary pond basin

Grappler.

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

Actions

Multiattack.

The mimic makes two pseudopod attacks.

Pseudopod.

Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 10 (1d8 + 6) 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: 15 (2d8 + 6) piercing damage plus 4 (1d8) acid damage.

Hooves (Object Form Only).

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage

Broken Clock (Object Form Only)(1/day).

All creatures riding the carousel must succeed on a DC 15 Constitution save have their age affected. If the creature has even Hit Dice it ages 1d10 years. If the creature has odd Hit Dice, it de-ages 1d10 years.

Spawn Steed (1/day).

The mimic exudes a polyp that functions as a Warhorse. This polyp remains active for 24 hours and remains friendly to creatures of the mimic's choosing. At the end of this time period, the polyp becomes a standard Mimic and acts on its own accord.

Reactions

Tenderize.

The mimic makes a Hooves attack against a prone or grappled target