"Again the green smoke rose and billowed. Again images unfolded before him (Conan), this time alien and seemingly irrelevant. He saw great towering black walls, pedestals half hidden in the shadows upholding images of hideous, half-bestial gods. Men moved in the shadows, dark, wiry men, clad in red, silken loincloths. They were bearing a green jade sarcophagus along a gigantic black corridor. But before he could tell much about what he saw, the scene shifted. He saw a cavern, dim, shadowy and haunted with a strange intangible horror. On an altar of black stone stood a curious golden vessel, shaped like the shell of a scallop. Into this cavern came some of the same dark, wiry men who had borne the mummy-case. They seized the golden vessel, and then the shadows swirled around them and what happened he could not say. But he saw a glimmer in a whorl of darkness, like a ball of living fire. Then the smoke was only smoke, drifting up from the fire of tamarisk chunks, thinning and fading."
Chapter 7: The Rending of the Veil, The Hour Of The Dragon, Robert E. Howard