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A Star of the City-class Library Risk levels are structured as follows: Rumor -> Urban Myth -> Urban Legend -> Urban Plague -> Urban Nightmare -> Star of the City -> Impurity The final rank, Impurity, is designated by the Head, while all other disaster levels are assigned by the Hana Association. Therefore, Impurity is strictly speaking less of a rank and more of an expulsion order from the Head, given to entities that have violated the City's taboos regardless of their danger or profitability. Unique equipment with special abilities excavated from the Ruins. A former Arbiter once used Artifacts as an example to explain the sheer power of extracted E.G.O; they possess immense performance and are incredibly rare. --- After being exiled to the Outskirts following the Impurity incident, the Library released everyone who had been turned into books and became a simple library that no longer conducts receptions.