Cthulhu is a fictional cosmic entity created by horror author H. P. Lovecraft in 1926, first appearing in the short story "The Call of Cthulhu" when it was published in Weird Tales in 1928.

Cthulhu is one of the central Great Old Ones of the Lovecraft Mythos. It is often cited for the extreme descriptions given of its hideous appearance, its gargantuan size, and the abject terror that it evokes.

Cthulhu is a bat-winged octopus-headed gargantuan giant, the size of a hill. It has clawed hands and feet and a somewhat boneless sac-like body. Its proximity drives humans insane.

The star-spawn of Cthulhu (or Cthulhi), although not extentsively described in Lovecraft's works, are depicted as sharing physical characteristics similar to that of Cthulhu himself; although their overall size is far smaller. The narrator of At the Mountains of Madness notes that

"the Cthulhu spawn…seem to have been composed of matter more widely different from that which we know than was the substance of the Antarctic Old Ones. They were able to undergo transformations and reintegrations impossible for their adversaries, and seem therefore to have originally come from even remoter gulfs of cosmic space…. "

suggest that they too, like Cthulhu, have bodies made of materials foreign to Earth.

While the particulars of their relationship with Cthulhu are unknown, is is clear that they arrived on Earth with him, where they constructed the city of R'lyeh . Although it is said that they continue to dwell in the sunken city of R'lyeh , it has also been rumored that a few them escaped this city's fate, and can be found in hidden places on Earth.

In "At the Mountains of Madness" the "Spawn of Cthulhu" wage a great war against the Elder Things after arriving on Earth.

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