Treatise on Monsters Known and Unknown

Treatise on Monsters Known and Unknown was a book written by Thardon Ilvynner between and. It was so important to him that he only accepted the position of the Magister when Azuth offered it because he deemed it useful for him to complete this work. As of the late 14 century DR, it was one of the main sources for useful information on the more dangerous creatures of Faerûn.