Mrin Codex
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The Mrin Codex is a fictional book of prophecy mentioned many times in David Eddings' Belgariad and Mallorean series of fantasy novels. Together with the Darine Codex, it provides the principal instructions for the Child of Light and his companions during the Age of Prophecy.
Eddings has gone on the record (in his guide to the series The Rivan Codex) to say the document does not exist in real life, being nothing more than a plot device to keep the narrative moving.