Werehouse

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.

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object. However, on a full moon, the mimic could potentially be distinguished from an ordinary object with a Perception check of 19 or higher.

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

Lycanthropic. On a full moon, the werehouse heals itself from the necrotic damage that it deals.

Blood of the Lycan. Upon rolling a 19 or 20 to attack with its Bite action, the attack is considered a critical hit. On hit, the target must succeed on a DC 16 Wisdom save, or become infected by the Curse of the Lycan, and turns into a werewolf on the next full moon.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 4) piercing damage with an additional 7 (2d6) necrotic damage. 

Swallow. The target creature must make a Dexterity save DC 17, being swallowed on a failed save. When swallowed, the target is considered grappled. Additionally, if the target is still swallowed at the start of the werehouse's next turn, the target suffers 17 (4d6 + 4) bludgeoning damage and an additional  13 (2d8 + 4) necrotic damage. If the house hunter takes 25 damage within one turn from any source, it must succeed a Constitution save DC 17 or the swallowed creature is thrown back out.