Vanessa explains to Seth through Coulter that she believes the cursed being in the Grove guarding the Vault containing the secret artifact was a Phantom. There are several Phantoms imprisoned in the Hall of Dread at Fablehaven.
The Sphinx is mentioned to have several Phantoms.
The Phantom Dezia , who resided at the Crypt at Crescent Lagoon , came to an agreement with Seth . The agreement said that if Seth voved threw her Token in the Baba Loa Volcano, she would reveal all she knew about the Everbloom 's location. Ronodin and the Sphinx however, knew that Dezia hadn't told Seth all she knew about the flower, and exploited her using her Token . Her token was eventually destroyed when Seth broke the connection to her old Token and created a new one for the Phantom, destroying it immediately after.