The Still Craft
Every servant of Serkis Bole lost their unholy intelligence and will at the end of the war, and now roam the land in bands much smaller than the old hordes. Without their master to guide them, raids made by the undead are far less effective than during the height of the war.
Little is known of these undead, as most top researchers, wizards, and sages were killed. For some reason, only minor minions wander into populated areas, while the more powerful servants are found deeper inland.
Traveling through undead regions is very dangerous, especially at night. If any undead attack, they must be dealt with quickly, or more will be attracted.