It seems that Lord British has taken off on a quest of his own. In the meantime, he has left his trusted adviser Blackthorn on the throne as Regent. Unfortunately, evil creatures known as the Shadowlords have gradually corrupted Lord Blackthorn, turning him from a benevolent leader into a cruel tyrant. In Ultima 5: Warriors of Destiny, it is up to the Avatar to return once again and save Britannia. Free Blackthorn from the power of the Shadowlords, and return Lord British to the throne.