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The Icon of Sin (aka Baphomet and Gatekeeper or Demonspitter) is a monster which first appears in Doom II. It appears two more times in Final Doom, and a similar creature is found in Doom II RPG, which appears in two forms VIOS (Virtual Icon of Sin), and a physical Icon of Doom (that spawned the VIOS virus). It makes yet another appearance in Doom (2016) where it is given a backstory. Its latest appearance is in Doom Eternal, where its full form is seen.