Shady Manor

Shady Manor is a structure that can form instead of a dungeon, but will still be struck by Landing Site. Shady Manor has no enemies, but once entered it grants the Lonely and Frightened debuffs. Entering the manor (or dungeon if Dungeon is chosen) will get rid of sanity all together. It also doesn't have a boss as you can enter the manor freely without being destroyed by guardians.

Debuffs

 * Lonely - Cannot summon any minions.
 * Frightened - 20% decrease to all stats, special animation (character trembles with a concerned face).
 * Darkened - Lost control. Randomly moves, jumps and uses items. The custom AI will often try to lead the player toward threats.

Interior

 * In the interior, dark air flows in the mansion. There are also silhouettes of blocks in light sources that appear only for about 0.5-1.8 seconds and then disappear, but sometimes an NPC can appear as a silhouette and may move around. Touching "dark air" will inflict Darkened for 3 seconds and will destroy the dark air.
 * The layout may appear to change slightly, but if the changed layout is touched, it will revert to normal state.
 * Spikemaces are in multiple areas, but they are dark like dark air and also inflict Darkened
 * Random sounds can be heard in the manor.

Quotes
The guide, nurse, and dryad may often talk about how the manor is haunted.
 * Guide: Be careful inside that manor, it is haunted after all.
 * Nurse: Let me follow you in whatever haunted manor [Guide's name] is talking about so I can see you get wounded by all those phantoms.
 * Nurse: Becareful in that haunted manor with the dark spirits!
 * Nurse: You can get possessed in the manor, so stay alert.
 * Dryad: Can I just purify the manor?
 * Dryad: CAN I PURIFY THAT MANOR?!?!?! (Blood Moon only)
 * Dryad: What about Skeletron? Where is he?