Illusio-pit

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An illusio-pit is a pit sector at least 128 units below its surrounding floor with no textures on the walls of the pit. The technique is often used in non-joke WADs to raise floors instantly, suddenly revealing enemies.

The name originated in wow.wad, an infamous and controversial WAD by Paul Thrussell which was his only public release, made in 1999. The level 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 above it. The text file of the level explained the pit as follows:

A cyberdemon has escaped from a lab, where they are trying to find his weakness. He was injured by a marine, which was made short work of, and he was trapped inside a illusio-pit.

Illusio-pits have been used in parts of Joke WADs such as Mock 2: The Speed of Stupid and The New Adventure.