There would be a Guide--and a very terrible one; a Guide who had been an entity of Earth millions of years before, when man was undreamed of, and when forgotten shapes moved on a steaming planet building strange cities among whose last, crumbling ruins the first mammals were to play. Carter remembered what the monstrous _Necronomicon_ had vaguely and disconcertingly adumbrated concerning that Guide: "_And while there are those_," the mad Arab had written, "_who have dared to seek glimpses beyond the Veil, and to accept HIM as guide, they would have been more prudent had they avoided commerce with HIM; for it is written in the Book of Thoth how terrific is the price of a single glimpse. Nor may those who pass ever return, for in the vastnesses transcending our world are shapes of darkness that seize and bind. The Affair that shambleth about in the night, the evil that defieth the Elder Sign, the Herd that stand watch at the secret portal each tomb is known to have, and that thrive on that which groweth out of the tenants thereof:--all these Blacknesses are lesser than HE WHO guardeth the Gateway: HE WHO will guide the rash one beyond all the worlds into the Abyss of unnamable devourers. For HE is 'UMR AT-TAWIL, the Most Ancient One, which the scribe rendereth as THE PROLONGED OF LIFE._" Memory and imagination shaped dim half-pictures with uncertain outlines amidst the seething chaos, but Carter knew that they were of memory and imagination only. Yet he felt that it was not chance which built these things in his consciousness, but rather some vast reality, ineffable and undimensioned, which surrounded him and strove to translate itself into the only symbols he was capable of grasping. For no mind of Earth may grasp the extensions of shape which interweave in the oblique gulfs outside time and the dimensions we know. There floated before Carter a cloudy pageantry of shapes and scenes which he somehow linked with Earth's primal, eon-forgotten past. Monstrous living things moved deliberately through vistas of fantastic handiwork that no sane dream ever held, and landscapes bore incredible vegetation and cliffs and mountains and masonry of no human pattern. There were cities under the sea, and denizens thereof; and towers in great deserts where globes and cylinders and nameless winged entities shot off into space, or hurtled down out of space. All this Carter grasped, though the images bore no fixed relation to one another or to him. He himself had no stable form or position, but only such shifting hints of form and position as his whirling fancy supplied.