Animated Rug of Smothering

A friendly rug of smothering is a wizard's lazy security system. The party inherits it, buys the tower it's in, or recruits the eccentric artificer who made it. The rug doesn't talk, doesn't reason, and recognizes "friend" only by whatever command word or sigil it was built around. Establish that command in fiction before you ever roll initiative on its side.

In a fight, position is everything. The rug walks 10 ft. and has Blindsight 60 ft., so the trick is staging the encounter where the enemy comes to it. A choke point in a corridor, the threshold of a vault, the floor of a bedchamber where an assassin will land after climbing through the window. Once an enemy is in reach, Smother grapples them with escape DC 13, Blinded, Restrained, suffocating, taking 10 bludgeoning each turn of theirs. The rug's job is not damage. Its job is to take one enemy out of the action while the party deals with the rest.

Warn the party that hitting the rug while it grapples sends half the damage through to its victim. That's a feature for the players if the victim is an enemy, but it also means the rug is fragile insurance and goes down fast under focused fire. With 27 HP and AC 12, plan on it lasting two rounds against anyone serious. Treat it as a one-shot tool that buys the rogue a turn to flank, not a recurring teammate.

Give it a name the players invent. A rug they call "Lord Snufflemuffin" gets mourned harder than one you described as a generic magic item.

The rug is a trap with initiative. It lies flat in a hallway, throne room, or wizard's study, and the party walks across it for one or two scenes before it ever moves. That delay is the whole encounter. Once it sits up, you have a Construct with 27 HP, AC 12, and a single trick: pick the squishiest Medium-or-smaller body in the room and bury them under wool.

Open by Smothering. The +5 attack is fine, but the real action is the alternative: instead of dealing damage, the rug grapples the target with escape DC 13, Blinded, Restrained, suffocating, and taking 10 bludgeoning at the start of each of their turns. Pick the wizard or the rogue, anyone with low Strength and no easy way to break free. While grappling, the rug can't Smother again, but it halves the damage it takes and the target takes the same amount. Allies who hack the rug are effectively hitting their friend. That's the whole puzzle the players need to solve, and it's a good one when you let the suffocation clock pressure them.

It cannot be panicked. Wis 3 and Int 1 mean it doesn't retreat, doesn't hesitate, doesn't release voluntarily. Construct immunities cover Charmed, Frightened, Paralyzed, Poison, Psychic. Walking speed 10 ft. and Blindsight 60 ft. mean it won't chase a fleeing target, but it absolutely will collapse on the next person who steps onto it. If the party leaves a body grappled and runs, the rug stays put and finishes the kill. The fight ends when the rug is destroyed or the room is empty.

Describe the room before the rug moves. The carpet's pattern, the dust around its edges, a small stain near the door. Players who notice you describing a rug start checking it, and that pre-fight tension is half of why this monster exists.