Champions of Midgard: Valhalla Expansion

While The Dark Mountains expansion extends the current game with more players and new challenges to defeat, the Valhalla expansion adds new mechanics in the form of a new resource to manage, secondary leader abilities, and leader dice which join on the battlefield. Now when your warriors die in battle, they help you by gaining favor in Valhalla. Will you use your fallen warriors to defeat the epic monsters or will you gain favor with the Valkyrie and receive their help in the form of blessings, artifacts, and powerful berserkers and shield warriors?