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Cthulhu
"They worshipped, so they said, the Great Old Ones who lived ages before there were any men … and … formed a cult which had never died … hidden in distant wastes and dark places all over the world until the time when the great priest Cthulhu, from his dark house in the mighty city of R'lyeh under the waters, should rise and bring the earth again beneath his sway. Some day he would call, when the stars were ready, and the secret cult would always be waiting to liberate him."
After finishing the manuscript, Thurston realizes he's now a possible target, thinking: "I know too much, and the cult still lives."