From publisher blurb:
Enter a rich, original world inspired by Norse and Germanic culture. Explore the dark places where Gooblitts and Dýrverr roam. Battle against the treacherous forces of Chaos led by Orcus and The Thrir. Die horribly at the hands of Greenskins while trying to get rich quick with your friends!
Mithgarthr takes its mechanics from the fifth edition of the world's most popular role-playing game, but molds them against its grim setting. Characters start at zero level with just the skills they have from their mundane profession (of which there are nine to choose from) and a desire to make a better life for themselves. Players may choose from seven races including the murine Ratten and the winged, hawk-like Fjothr. Life is cheap and death comes often, but those adventurers who survive long enough to attain first level have eight iconic classes to choose from. Magic is cast using a point system, and is less common than usual. Monsters have their own magic system, drawing their power from Orcus.
Included in this core rulebook is everything you need to play a campaign in the land of Mithgarthr. Character creation rules, combat, adventuring, equipment, magic, monsters, world and setting information including a completely detailed large city, and also a fully fleshed out town and surrounding area including an introductory adventure to begin your journey into the realm of Mithgarthr!