Grim

The grim can move through other creatures and objects as if they were Difficult Terrain. The grim takes 1d10 Force damage if it ends its turn inside an object.

Add your Proficiency Bonus to any ability check or saving throw the grim makes.

Melee Attack Roll: Bonus equals your spell attack modifier, reach 5 ft. Hit: 1d6 + 3 plus your Wisdom modifier Necrotic damage, and if the target is a creature, it has the Frightened condition until the start of your next turn.

Trigger: A creature moves out of the grim's reach. Response—dWisdom Saving Throw: Your spell save DC, the triggering creature. Failure: The target's Speed is 0 until the end of the turn.