From the publisher: "I am Legion; for we are many." The forces of Hell are innumerable and varied, but fear not, for there are those who have dedicated their lives to detailing the strengths and weaknesses of the infernal legions. This 16-page expansion to the All for One setting includes 10 new fiends, four NPC archetypes, one mundane beast, advice for adding horror to your campaign, rules for fear and terror, and guidelines for incorporating holy relics.