"He had passed too far beyond this world ever to touch it except in the ceremonies of the Golden Window. Man, demon, god, mutation into namelessness--whatever he had been, he had kept but one link to the Dark World which spawned him. A link enshrined in the Sword Called Llyr. By that talisman he could return for the sacrifices that fed him, return for the great ceremonies of the Sealing that had made me half his own. But only by that talisman."
— Henry Kuttner (The Dark World)