When Feyre Archeron is captured in Under the Mountain, Amarantha tells her that she can free Tamlin if she successfully passed three trials. Defeating the Wyrm was Feyre's first trial, assigned to her by Amarantha, and it was a feat deemed impossible by all of the spectators. Feyre almost gets killed multiple times and makes a fool of herself because the Wyrm is blind. With the help of Lucien Vanserra, Feyre manages to set a trap for the worm using the bones of its previous unlucky meals and unfortunate victims. It dies at her hands, but she is severely wounded during the task and her injury is what leads her to strike a bargain with Rhysand: his healing services in exchange for one week per month of her company in the Night Court for the rest of her life.
Feyre described the Wyrm as a giant pinkish brown worm with its front end being an enormous mouth filled with ring after ring of razor-sharp teeth. It's blind and relies on scent to see. It also smells horrible.
- The Bone Carver asks for the bone that killed the worm in his bargain with Feyre and Rhysand when they visit him in the Prison.
|Main Characters||Feyre Archeron · Rhysand · Nesta Archeron · Cassian · Azriel · Elain Archeron · Tamlin · Lucien Vanserra · Morrigan · Amren · Amarantha · King of Hybern|
|Supporting Characters||Alis · Andras · Beron · Bogge · Bone Carver · Bron · Cerridwen · Clare Beddor · Cresseida · Drakon · Devlon · Emerie · Eris · Graysen · Gwyneth Berdara · Feyre's Father · Hart · Helion · Ianthe · Isaac Hale · Isaac Hale's Wife · Jurian · Kallias · Keir · Koschei · Mercenary · Miryam · Mortal Queens · Mrs. Laurent · Naga · Nuala · Unnamed Summer Court Faerie · Tarquin · Suriel · Thesan · Tomas Mandray · Varian · Vassa · Weaver|
|Mentioned Characters||Aunt Ripleigh · Dark Mother · Feyre's Mother · Mother · Rhysand's Father · Rhysand's Mother · Rhysand's Sister · Nostrus · Queen of the Black Land · See more...|
|Under the Mountain|
|Characters||Tamlin (former) · Feyre Archeron (former) · Lucien Vanserra (former) · Amarantha † · Jurian (former) · Rhysand (former) · Beron Vanserra (former) · Lady of the Autumn Court (former) · Eris Vanserra (former) · Lucien's Brothers (former) · Tarquin (former) · Cresseida (former) · Varian (former) · Attor † (former) · Middengard Wyrm † · Helion (former) · Kallias (former) · Thesan (former) · Nuan (former) · Amarantha's Daemati · Brutius † · High Fae of the Third Trial † · Female High Fae of the Third Trial † · Bron (former) · Hart (former) · Unnamed guards|