Fake floor

An Illusio Pit is a pit sector at least 128 units below its surrounding floor and does not have its walls textured. It is often used as a dummy sector to raise the floors instanatly suddenly revealing the enemies. It was given its name in wow.wad, an imfamous and controversial wad by Paul Thrusell which was his only release in 1999 consists of a room with a pit which has its walls untextured. A Cyberdemon is placed inside the large inescapable pit while there is a hanging torso. You are given a BFG and a few other items. The level has no exit. Illusio Pits have been used in parts of other Jokewads such as Mock 2: The Speed of Stupid and The New Adventure.