From the back of the book:
From beneath the Outer Ocean, from out of the depths of the Great Salt Marsh, and from the odd fanes of the Street of the Gods, they come: the Patrons of Lankhmar! With the information contained in this tome, a judge can introduce such formidable beings as the Sea King, Mog the Spider God, Sheelba of the Eyeless Face, and even Death himself into any DCC RPG campaign setting.
This early look at the upcoming Dungeon Crawl Classics Lankhmar line introduces a half-dozen supernatural powers and eerie entities for use in your DCC RPG or Lankhmar campaign. Each power’s entry includes details on the entity and their role in Nehwon, tables for invoking that power’s aid, corruption charts for when things go wrong, and new spellburn possibilities. Are you ready to serve the Patrons of Lankhmar?