The earliest I remember hearing this comment was about Dragonlance, which began to be published in 1984. There was earlier RPG-influenced fiction, though, as far back as Norton's Quag Keep (1978). Do we know the origin of the phrase?
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This isn't specifically RPG influenced but tangentially related - Philip Dick used the I-Ching to make decisions for The Man in the High Castle, which was in 1962. From an interview, he said: "I used it in The Man in the High Castle because a number of characters used it. In each case when they asked a question, I threw the coins and wrote the hexagram lines they got. That governed the direction of the book." Literal coins being flipped in the background!
– Blastromech Oct 14 '21 at 17:17