From publisher blurb:
War is hell at the best of times, but it gets worse when the powers of Hell are directly involved.
Satan’s Playground expands All for One into the Thirty Years’ War, a brutal conflict that is ripping Germany and neighboring lands apart.
As survivors of the ever-expanding war, characters will face the ravages of plague, marauding armies, cruel mercenaries, Satanic cults, starving peasants who will sink their teeth into anything edible, and twisted fiends from hell.
Contents include new character options, a history of the war as far as 1636, a gazetteer detailing Germany and her neighbors, rules for foraging and scavenging, diabolical mundane and supernatural threats, and advice for running adventures in a war torn land.