Dave Arneson's Blackmoor: Age of the Wolf

From the back of the book:

In Blackmoor: Age of the Wolf, the world of Blackmoor gets a bold new look, dragging the setting into an age of intrigue, simmering conflict, and strife. Centuries have passed since the time of the original campaign, and the years have not been kind to the North. The Kingdom of Blackmoor collapsed, plunging the land into calamity and open war. In its wake, the nobility has fallen to infighting, festering resentments, and espionage. Magic and technology alike have run amok, raising the stakes on both the present and the future. In this time of dark uncertainty, what mark will your story make on the war-torn North?