From the introduction: Fast as fire spreads and as majestic and terrible as an eagle upon its prey - the nightmare is a devil's steed broken free from the flames of the Nine Hells. Coveted by cultists and warlocks of the great fiends, those who are in tune enough with the arcane and religious spirits of the world know well enough to either cast it back to its realm or kill it, lest its masters soon follow to reclaim what is theirs, or lest someone even worse claims it as their own. User summary: For 3rd level characters.