The Yellow King was an eldritch abomination of some sort. In the 925th Universe, the wizard Artemas H. Whipple opened a wizarding school in Crieff to train young wizards, with the secret purpose of moulding them into weapons with which to fight the King. (PROSE: Good Crieff - The Tribulations of the Scottish Division)
Behind the scenes
The King in Yellow, or Yellow King, is the titular figure of The King in Yellow, a 1895 short story anthology by Robert W. Chambers, appearing in a cursed play of the same name which sends all who read or see it mad. The anthology was later incorporated into the “Cthulhu Mythos”, with it becoming understood that the King in Yellow was a manifestation of Hastur, a fictional deity previously mentioned in a short story by Ambrose Bierce, and name-dropped elsewhere in The King in Yellow by Chambers with no particular implication that he and the King were the same entity.
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