Treacherous Mansion
Template:Location-infobox The Treacherous Mansion is the final and longest mansion that Luigi visits in Luigi's Mansion: Dark Moon. It is a large museum and is also the location of the final Dark Moon piece. Many rooms on the first floor of the Treacherous Mansion are based on the previous mansions in the game. Almost every ghost that Luigi encounters appears here, though most of them are stronger. King Boo comes to this mansion to open a paranormal portal to unleash almost every ghost that Luigi has ever encountered, such as Greenies, Slammers, a Gobber, Sneakers, mummies, Hiders, and Creepers, and most of these ghosts are either shielded, strong, or equipped with a weapon of some form. This multitude of ghosts will bring about the destruction of Evershade Valley. There are also gargoyles inside and outside the mansion.
The Treacherous Mansion is the only mansion in the game that requires Luigi to unlock just one door; the rest of the doors are already unlocked. It is also the only mansion besides the Gloomy Manor and Old Clockworks that has multiple music tracks; the track changes whenever Luigi looks through a window or crack in the wall. It is also the only mansion to have two missions primarily dealing with ghost-capturing: Paranormal Chaos and Terrifying Invasion. It is also the only mansion to have multiple false doors. Finally, it is the only mansion whose respective Dark Moon piece and possessor ghost are not found in the mansion's vicinity.
The bottom four exhibits in the mansion are based on the four previous mansions in the game in some way. The Dark Ages Exhibit represents the Gloomy Manor due to the knights found in the manor (despite not having the same music tracks), the Jungle Exhibit represents the Haunted Towers due to both having botanical designs, the Ancient Exhibit represents the Old Clockworks due to the latter having an Ancient Egyptian-like basement, and the Ice Age Exhibit represents the Secret Mine for their icy themes.
History
The Treacherous Mansion is an abandoned museum positioned right in the middle of a giant ravine, which becomes cut off from land access after Luigi reaches the front steps. According to E. Gadd, the mansion contains artifacts and items from Evershade Valley and beyond, making it the most "precious" of the mansions. The mansion is slightly changed to a spookier feel after King Boo arrives. It is called the Treacherous Mansion likely because it could collapse into the ravine below. It, however, does not at any point.
In-game description
This massive mansion is filled with exotic exhibits created by its late globe-trotting owner. Oh, and it also contains the strongest paranormal signals ever recorded!
This massive mansion is filled with exotic exhibits fashioned by its globetrotting late owner. Oh, and it also has the strongest paranormal signals ever recorded! (PAL version)
Missions
| Mission | Image | Description | |
|---|---|---|---|
| E-1 | Front-Door Key | 
|
The paranormal activity in this mansion is completely off the charts! Stay on your toes, and start looking for the Dark Moon piece. |
| E-2 | Double Trouble | 
|
I assigned a Toad assistant to take care of the valuable exhibits in the Treacherous Mansion. Let's find him. He might know a thing or two about the Dark Moon piece. |
| E-3 | A Train to Catch | 
|
The Toad curators brought a security-camera image back with them. Maybe it'll give us some clues about the next Dark Moon piece. |
| E-4 | Ambush Maneuver |
|
Luigi, King Boo is in the Train Exhibit! Let's strike now, while we have the element of surprise! Get in there, defeat King Boo, and rescue Mario! |
| E-5 | Paranormal Chaos | 
|
I'm getting strange paranormal readings on the Terrace. We'd better send you in to inspect the place. |
| Boss | Stop the Knightmare | File:E-Boss.PNG | The portal on the Terrace is still open, but we've got to hurry. Button up those overalls, my boy! It's time to battle King Boo! |
| Bonus | Terrifying Invasion | 
|
We have an EMERGENCY! The Parascope is detecting whopping paranormal signals in the mansion! Luigi...THE END IS NEAR! |
Treasures
Bosses
- Mini-bosses: Strong Poltergeist, Big Boo
- Bosses: Tough Possessor (possessing suits of armor)
Rooms
First Floor
(Ground Floor in PAL version)
First Floor West Side
(Ground Floor West Side in PAL version)
- West Gallery
- Dark Age Exhibit (Dark Ages Exhibit in PAL Version)
- Grand West
- Kitchen
- Ice Age Exhibit
First Floor East Side
(Ground Floor East Side in PAL version)
- East Gallery
- Jungle Exhibit
- Grand East
- Restrooms (Toilets in PAL Version)
- Ancient Exhibit
Second Floor
(First Floor in PAL version)
Second Floor West Side
(First Floor West Side in PAL version)
Second Floor East Side
(First Floor East Side in PAL version)
Third Floor
(Second floor in PAL version)
Basement 1
- Veranda
- Bottom of Well (Bottom of the Well in some regions)
- Guard Tunnel (Guarded Tunnel in PAL Version)
- Ceremonial Chamber
- Cliffside
- Jungle Exhibit
- Ancient Exhibit
Basement 2
Basement 3
Media
 Treacherous Mansion Music - The song that plays in the Treacherous Mansion. | File info |
| Terrifying Invasion Music - The song that plays during Terrifying Invasion. | File info |
Names in other languages
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | オドロ～宮殿[?] odoro~ kyūden |
From「驚き」(odoroki, fright) and「宮殿」(kyūden, palace) | |
| Dutch | Verraderlijke Villa[?] | Treacherous Villa | |
| German | Trugschloss[?] | Deception Castle | |
| Italian | Villa Villana[?] | Boorish Mansion | |
| Korean | 위태로운 대저택[?] Witaeroun Daejeotaek |
Great Mansion of Danger | |
| Portuguese | Mansão Traiçoeira[?] | Treacherous Mansion | |
| Spanish | Mansión Traicionera[?] | Treacherous Mansion |
Trivia
- This is the only mansion where Luigi has to rescue two Toads in one mission.
- While Luigi is under the mansion in the Dungeon Cells, Professor E. Gadd will call him, but with no interference with the DS.
- The Treacherous Mansion is likely based on William Hope Hodgson's 1908 novel The House on the Borderland, in which the denizens of the titular house are assaulted by creatures from another dimension. Similarly, the house in the novel gets a large portion of the ground below it spirited away, leaving the house stranded on a ledge directly above a large water-filled ravine.
