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The "Myth of Er" is a story told by Plato at the end of his work, The Republic. It describes the fate of souls after death, where they are judged and then choose their next incarnation. This concept, where souls are transformed into a new existence, is known as transmutation.12

In the myth, souls drink from the river of oblivion, Lethe, before being reborn, forgetting their past lives. This myth explores themes of justice, reward, and punishment in the afterlife, influencing later philosophical and religious ideas about eschatology.3

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