Final boss



The Icon of Sin (sometimes called Baphomet in both the Doom community and various levels and add-ons) is the boss of Doom II MAP30: Icon of Sin as well as MAP30 of TNT: Evilution and Plutonia (In which it is referred to as the "Gatekeeper"). See the walkthrough for a gameplay description.

All the other monsters are a single Doom thing, but the Icon of Sin is made up of a number of parts:
 * Romero's head is the thing that must be destroyed. It starts with 250 hit points, but it is hard to hit due to its location deep in a hole.
 * A Spawn shooter in front of the head launches skull cubes. This is reminiscent of how Satan gives birth to his daughter Sin in John Milton's Paradise Lost in that she is born out of his head (a parthogenesis originally based on Zeus and his own daughter, Athena).
 * Several Spawn spots are located around the map. These are where the skull cubes land and spawn a monster.
 * Wall textures ZZZFACE1 through ZZZFACE9 are arranged to construct a demon face with a hole into its brain. This is what the player sees as the Icon, but it has little to do with its functioning.

Trivia
Reversed, the DSBOSSIT is a distorted John Romero saying "To win the game you must kill me, John Romero".