The Black Stone
'The Black Stone' is a classic short story by Robert E. Howard, first published in the November 1931 issue of Weird Tales. The story introduces the mad poet Justin Geoffrey and the fictitious Unaussprechlichen Kulten by Friedrich von Junzt.
Among Howard's stories that can be considered part of the Cthulhu Mythos — this one is no exception — it is written as a mythos story rather than as simply a tale compatible with the Lovecraftian universe. It follows the same pattern and has the same features as H.P. Lovecraft's classic work, and it is an obvious wink to Howard's friend and mentor, Lovecraft himself.