A grue is a term for a fictional predatory monster that dwells in the dark. The word was first used as a fictional predator in Jack Vance's Dying Earthuniverse (described as being part "ocular bat", part "unusual hoon", and part man). Dave Lebling introduced a similar monster, whose name was borrowed from Vance's grues, into the interactive fiction computer game Zork, published by Infocom. Zork's grues fear light and devour human adventurers, making it impossible to explore the game's dark areas without a light source. The grue subsequently appeared in other Infocom games. Due to Zork's prominent position in hacker history and lore, grues have served as models for monsters in many subsequent games, such as roguelike games and MUDs. A common catchphrase associated with grues is the line that displays whenever players in Zork and related Infocom games enter a dark area without a light source: "It is pitch black. You are likely to be eaten by a grue."

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