Spiderdemon

The Spider Mastermind (called also the Spiderdemon) is a die-hard creature, the boss of Episode III (Inferno) of Doom. His weapon is a big machine gun that has the sound of the shotgun but with a spread similar to the player's chaingun. When a Spider Mastermind begins firing, it will not stop until his target moves out of his view or dies, or if he is killed. Similar behavior can be observed with the Chaingunner and Arachnotron.