For the Cellar that appears in Luigi's Mansion, go here!

Cellar (Luigi's Mansion 2)
Area Gloomy Manor
Normal Ghosts Grouchy Possessor
The Cellar is a room within Gloomy Manor in Luigi's Mansion: Dark Moon. It is covered in spider webs all over, and various items such as barrels and boxes reside in the room. Suits of armor also appear in the Cellar to either aid or hinder Luigi's progress with the boss. There is one fan on the ceiling which eventually gets destroyed. Several pillars also fall down during the course of the fight.

It is the arena of the boss fight with the Grouchy Possessor and the Spider Queen (who he possessed), and is only ever available in the boss mission: "Confront the Source". The one and only time Luigi takes the elevator down to the Cellar, the elevator malfunctions and breaks, preventing further access. The Cellar is made up of one long hallway, and an alcove to the right. As the battle with the Possessor goes on, the Spider Queen will break the walls, allowing Luigi to go deeper into the Cellar. When Luigi defeats the boss, the Spider Queen and her spiders will retreat back into a large crack in the wall.