Unclassified is the unofficial name for any enemy in Doom Eternal or its dlc releases that isn't classified into any of the four enemy types (Fodder, Heavy, Super Heavy, and Ambient). Currently, this only encompasses the Whiplash Spectre, in The Ancient Gods - Part One, as well as some of the Master Levels for the base game. They have no specific health pool, damage output, or set amount of fuel required to chainsaw.
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