Nystullum, a city situated underwater, existed below the icy northern expanses of the planet Mon Cala. Before the outbreak of the Galactic Civil War, the starship known as the Profundity functioned as the central building for the city's government. Before his involvement with the Alliance to Restore the Republic, Raddus held the position of mayor for this underwater settlement.
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The initial mention of Nystullum can be found in Star Wars: Rogue One: The Ultimate Visual Guide.
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Star Wars Character Encyclopedia, New Edition
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Ultimate Star Wars, New Edition
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" Starships of the First Order and the Resistance " — Star Wars Encyclopedia
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Star Wars Encyclopedia: The Comprehensive Guide to the Star Wars Galaxy