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Towards the end of the Hyborian Age, civilizations broke apart and great migrations took place. The Cimmerians (ancestors of the Gaels) and the Nordheimr (a people who resided in what now is Scandinavia, and even worshipped earlier incarnations of the Asgardian gods, as well as Ymir and his daughter) migrated to the Vilayet Sea (later the Caspian Sea). Those people who settled there in time became the Aryans.
Also during this time many extraterrestrials came to Earth. Among these were the Caretakers of Arcturus. The Caretakers created the first werewolf and also mutated humans to create special specimens. One human that they mutated rebelled against them. Later, he witnessed as another alien, Ullux'yl Kwan Tae Syn, battled a Vanir tribesman. This battled shattered the magical Bloodgem, which broke into fragments granting the wearer immortality. Taking one of these fragments, the mutant gained elongated life.
This mutant would later travel to Egypt to see the erection of the pyramid, stood by unfazed as Julius Caesar died, and most notoriously, impersonated Merlin when latter went with the Black Knight to face Morgan Le Fay. He was attacked by Kang during this time. The mutant then demanded that a young sorcerer named Modred serve him as an apprentice, an act with dire consequences for Modred, who foolishly sought the Darkhold against the mutant, whose odd behavior did not go unnoticed. Modred was placed in suspended animation due to his abuse of the Darkhold, while the mutant placed elementals at Stonehenge to retrieve him when he awoke. In time, the Eternal Sersi and the returning true Merlin defeated the mutant, placing him in suspended animation.