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For a moment he was quite stupefied by what he saw. It was not the all-covering dust and cobwebs of immemorial aeons, the fluttering winged things, the shriekingly loathsome sculptures on the walls, the bizarre form of the many basins and braziers, the sinister pyramidal altar with the hollow top, or the monstrous, octopus-headed abnormality in some strange, dark metal leering and squatting broodingly on its hieroglyphed pedestal, which robbed him of even the power to give a startled cry. It was nothing so unearthly as this—but merely the fact that, with the exception of the dust, the cobwebs, the winged things, and the gigantic emerald-eyed idol, every particle of substance in sight was composed of pure and evidently solid gold.

Even the manuscript, written in retrospect after Zamacona knew that gold is the most common structural metal of a nether world containing limitless lodes and veins of it, reflects the frenzied excitement which the traveller felt upon suddenly finding the real source of all the Indian legends of golden cities. For a time the power of detailed observation left him, but in the end his faculties were recalled by a peculiar tugging sensation in the pocket of his doublet. Tracing the feeling, he realised that the disc of strange metal he had found in the abandoned road was being attracted strongly by the vast octopus-headed, emerald-eyed idol on the pedestal, which he now saw to be composed of the same unknown exotic metal. He was later to learn that this strange magnetic substance—as alien to the inner world as to the outer world of men—is the one precious metal of the blue-lighted abyss. None knows what it is or where it occurs in Nature, and the amount of it on this planet came down from the stars with the people when great Tulu, the octopus-headed god, brought them for the first time to this earth. Certainly, its only known source was a stock of pre-existing artifacts, including multitudes of Cyclopean idols. It could never be placed or analysed, and even its magnetism was exerted only on its own kind. It was the supreme ceremonial metal of the hidden people, its use being regulated by custom in such a way that its magnetic properties might cause no inconvenience. A very weakly magnetic alloy of it with such base metals as iron, gold, silver, copper, or zinc, had formed the sole monetary standard of the hidden people at one period of their history.


- H.P. Lovecraft and Zealia Bishop, The Mound, Chapter 3