Transported beyond his age and his own individuality, he was seeing the transmutation of the being men called Khosatral Khel which crawled up from Night and the Abyss ages ago to clothe itself in the substance of the material universe.
But human flesh was too frail, too paltry to hold the terrific essence that was Khosatral Khel. So he stood up in the shape and aspect of a man, but his flesh was not flesh; nor the bone, bone; nor blood, blood. He became a blasphemy against all nature, for he caused to live and think and act a basic substance that before had never known the pulse and stir of animate being.
He stalked through the world as a god, for no earthly weapon could harm him, and to him a century was like an hour.
From The Devil in Iron, one of the better early Conan short stories.