Azetlor is from Ghostbusters: The Video Game (Realistic Versions), and in Ghostbusters: The Video Game (Stylized Versions).Edmund Hoover, Edmund Hoover aka the Collector, The Library Serial
Killer, Azetlor, Keeper of Knowledge, Azetlor the Finder, Azetlor the Collector, Azetlor the Returner, Azetlor the Lost, Azetlor the Destroyer and Bookworm.
In life Azetlor, Keeper of Knowledge, was once a powerful leader in Ivo Shandor's Cult of Gozer by the name of Edmund Hoover, a philologist and serial killer known as 'The Collector'. Around 1923, Hoover seduced Eleanor Twitty, head librarian and curator of the New York City Public Library's Special Collections in an effort to gain access to the Gozerian Codex.
In March 1924, Twitty had discovered Hoover's true motivations and refuse to allow him further access to the Special Collections. Hoover then murdered Twitty and hid her body in the secret chambers built by Shandor beneath the Library's basement. He also murdered many others to cover up Twitty dead and collected their bodies like he collected books. The New York Police Department were unable to find the body of Eleanor Twitty despite a number of room-to-room searches of the book stacks, though they were able to charge Hoover with a number of other murders. He was convicted for his crimes and sentenced to death by hanging. Before he was hanged his last words where that he will return/reborn as Azetlor and guard all rare books in its collention.