Hastur, also known as the King in Yellow, is one of the many Great Old Ones and Cthulhu Mythos deities, acting as one of the most mysterious of Lovecraftian gods. First appearing in Ambrose Bierce's Haita the Shepherd, the god has been stated to be Cthulhu's half brother, a fallen angel, the god of shepherds, and the duke of Hell itself. He is also the main villain of Magicka, under the name Assatur, who plotted to destroy Midgård by possessing the powerful magician Grimnír, and trick the…