The Library of Tarchamus was a secret library hidden deep inside a mountain in ancient Netheril in a location a few days journey from present day Everlund. The library was built by the legendary arcanist Tarchamus the Unyielding both as a repository for his knowledge and as a trap for his Netherese rivals. Many Netherese arcanists fell victim to traps or Tarchamus' mummy while searching the library for his secrets. The library was destroyed in 1478 DR by the warlock Farideh and her cambion master Lorcan and allies in order to prevent Shadovar from gaining access to the library's knowledge.