Black Library

The Black Library is a division of Games Workshop (formerly a part of BL Publishing) which is devoted to publishing novels and audiobooks (and has previously produced art books, background books, and graphic novels) set in the Warhammer Fantasy Battle, Warhammer Age of Sigmar and Warhammer 40,000 fictional universes. Some of Black Library's best known titles include the Gaunt's Ghosts and Eisenhorn series of novels by Dan Abnett and the Gotrek and Felix series by William King and Nathan Long. The authors of these novels, graphic novels, and comics created original storylines and characters that are based on playable armies in the main Warhammer 40,000 game and its many spin-offs (such as Inquisitor or Epic). These works are then promoted with contributions of stories, plot synopses, and rules in the White Dwarf magazine and at the official Games Workshop website.

From the Wikipedia article “Black Library”, licensed under CC BY-SA 4.0.

Large trade publishers generally accept manuscripts only through literary agents, while many independent and small presses accept direct submissions during reading periods. Before submitting anywhere, read the publisher's current guidelines, study recent books on its list, and never pay a reading or publishing fee to a traditional publisher.