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It is a fantastical creature mentioned in the Cthulhu Mythos (The Whisperer in the Dark) by American writer Howard Philips Lovecraft, but the character was developed by other authors, most notably his colleague Frank Belknap Long, who actually called them The Hounds of Tindalos because they were not really canids but trackers and hunters. immortal beings capable of traversing "the angles of time" and appearing at any time to devour their victims.