The Malicious House is a rare event where the player spawns in a medium sized house. The interior of the house is bathed in an insidious red glow.
In one of the rooms, the player encounters a mysterious looking obelisk and when interacted with gives the player a choice to either touch the obelisk or refuse. This results in the character interacting with the obelisk taking 2 hit points of damage (lethal) and gaining a point in strength, fitness or shooting.
The interior of the house will revert back to its original color once the player chooses to touch the obelisk. However, there is a visual glitch where if you enter a few rooms it will turn red again.