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Marta Zell (マルタ・ツェル, Maruta Tseru) was an Immanity that lived during the Great War. She is the wife of Ivan Zell and the mother of Nonna Zell.
When Riku Dola returned to the base and announced Ivan's death, she led Nonna back to their living quarters without blaming him by one bit, despite tears of grief streaming down her face. She doesn't appear in the anime and Couronne Dola fulfilled her role instead.