I think this fits best here, of anywhere. From Pelgrane Press:Kickstarter: The Yellow King
Four periods (Paris 1890s, Europe 1947, two timelines in the present day) each are tainted by the intrusions of R. W. Chambers' alien ruler through the ruinous play The King in Yellow
This isn't presented as part of the Cthulhu Mythos, though that's coming up as a late stretch goal.
Some earlier manifestations:The Repairer of ReputationsCassilda's Song This post has been edited by uncle_jimbo on Jul 5 2017, 21:41