An ice-born predator, the slaying mimic appears as an abandoned sleigh on the snow, or one parked just outside a northern community. It's adapted to be a fast predator and uses the chilled climate to its advantage. It waits until potential meals are within striking distance and crushes them under rails. Those that survive, and even those that do not, are stuck to the sleigh as it continues on its bloody path. Thus, it's often easy to track this mimic by the trail of frozen gore that it leaves. Occasionally, a remote village will appease and 'tame' one of these monstrosities with a sharing of meals. They find its independent locomotion useful in getting supplies and people from one place to another. However, when thegame gets thin it is often these villagers that end up devoured when the mimic goes hungry.

Slaying Mimic

Large monstrosity (shapechanger), neutral

Armor Class 14 (natural armor)

Hit Points 119 (14d10 + 42)

Speed 15ft

Str 18 Dex 14 Con 16 Int 5 Wis 14 Cha 12

Skills Stealth +8

Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks that aren't adamantine

Damage Immunities acid, cold

Condition Immunities prone

Sensesdarkvision 60 ft, passive Perception 12

Languages -

Challenge 6 (2,300 XP)

Shapechanger.

The mimic can use its action to polymorph into a sleigh 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. While in slay form, the mimic's Speed becomes 50ft.

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 15). Ability checks made to escape this grapple have disadvantage.

Blitz (Object Form Only).

If the mimic moves at least 25 ft. straight toward a target and then hit it with a slam attack on the same turn, the target takes an extra 7 (2d8) bludgeoning damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone. If the target is prone, the mimic can make bite attack against it as a bonus action.

Drag (Object Form Only).

Whenever the mimic moves while grappling creatures, it moves at full speed instead of half.

False Appearance (Object Form Only).

While the mimic remains motionless, it is indistinguishable from an ordinary sleigh.

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: +7 to hit, reach 10 ft., one target. Hit: 9 (1d10 + 4) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite.

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing plus 4 (1d8) acid damage.

Slam (Object Form Only).

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d8 + 4) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bonus Actions

Dasher.

The mimic uses the Dash action.