K'n-yan

K'n-yan (or Xinaián) is a fictional, subterranean land in the Cthulhu Mythos. The underground realm was first described in detail in H. P. Lovecraft's revision of Zealia Bishop's "The Mound" (1940), in which it is discovered by the 16th century Spanish Conquistador Zamacona. Lovecraft also mentions K'n-yan in "The Whisperer in Darkness" (1930) and in his revision of Hazel Heald's "Out of the Aeons" (1935). The people of K'n-yan are sometimes referred to as the "Old Ones", a term of variable meaning in Lovecraft's fiction.

Summary

K'n-yan is a blue-lit cavern beneath Oklahoma. It is inhabited by a human-like race that resemble the Native Americans of the area, though they are actually extraterrestrials who arrived in prehistoric times. They are immortal and have powerful psionic abilities, including telepathy and the ability to dematerialize at will. They are also technologically advanced, using machines that employ principles of atomic energy, though they have largely abandoned their mechanized culture, finding it unfulfilling.