The Great Storm Chamber Library, also known as the Great Sewer Library, was the Great Library established by the Librarians Academic in Undertown after being driven out of the Chantry Palace by the Guardians of Night. It was destroyed in the Dark Maelstrom, but the librarians planned ahead and took their barkscrolls to safety.

The Great Library's scrolls were stored on floating lecterns made from buoyant Lufwood.