Poltergeist

Poltergeist is a mini-boss in Luigi's Mansion: Dark Moon. While Luigi explores the Gloomy Manor, Professor E. Gadd insists he capture this ghost for study purposes. A blue version of the Poltergeist is the mini-boss of Old Clockworks, and a Super Poltergeist is the mini boss of Treacherous Mansion. The Poltergeist can also be encountered as a boss on the ScareScraper under the name of The Brain. The Brain is the same as the regular Poltergeist except it has 300 HP.

Abilities
The Poltergeist has the power to move objects with telekinesis. When Luigi fights the Poltergeist, it throws books at Luigi while Luigi searches for it. It can also throw books at Luigi while its being sucked into the Poltergust 5000 to get away. Additionally, it can create up to two clones of itself that Luigi will need to dispose of before he can suck up the main ghost. It also plays the piano during the entire battle. In the ScareScraper, it is capable of causing a large explosion to get rid of any Luigis that are capturing it.