The Mortal Instruments is a series of six young adult fantasy novels written by American author Cassandra Clare, the last of which was published on May 27, 2014. The Mortal Instruments is chronologically the third series of a planned five in The Shadowhunter Chronicles but was the first one published. It follows Clarissa Fray, who interacts with a group of Nephilim known as Shadowhunters while also discovering her own heritage and her family history. The Shadowhunters protect the world of mundane/human people, who are also called mundanes or "mundies", from dark forces beyond their world.
In City of Ashes, the Faerie Realm and its inhabitants are characters from Holly Black's faerie series, beginning with Tithe: A Modern Faerie Tale. Also, the characters Val and Luis from Valiant: A Modern Tale of Faerie appear in another scene in that book. Within Holly Black's third book, Ironside: A Modern Faery's Tale, there is a reference to the Mortal Cup mentioned in the Mortal Instruments series.
Clare delved deeply into world mythology in order to build the Shadowhunter world featured in The Mortal Instruments, The Infernal Devices, and all other offshoots of the series. There are strong influences from Paradise Lost and The Inferno; while there are many references to Western religious mythology, Clare also studied world mythology deeply, specifically demonic myth featured in Japanese, Tibetan, and other Eastern cultural texts. Her references to angels and nephilim throughout the series also come from this study of world religions and folklore. These myths were then adapted to fit into her stories.
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