Cordelia Zimmer was a human slave. She was bought by the Exekian Matta to function as a mother to his daughter Arina, as part of an experiment.

In spite of these circumstances, Matta and Cordelia developed romantic feelings toward each other. After Arina died at the age of eight, the two began a relationship, which ostracized them both.

Matta attempted to find a way to stop Cordelia from dying, creating an "elixir of life" for this purpose. Cordelia agreed to ingest the experimental elixir, dying as a result.

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