A Fallen Warlord: a short novel in Bloomington, MN

Lord Zuriel, a warlord and sorcerer, appears out of nowhere and threatens the Island Kingdom of Armelos with a huge army of goblin-like creatures. However, the warlord proves to be incompetent as a military leader. The forces of Armelos defeat him easily, and take him prisoner.They've just made the biggest mistake of their lives.