After emerging victorious from a tournament, the Guardian finds the city under attack by large Spiders. Pursuing through the sewers, the Guardian discovers that the benevolent ruler Kaylee and the Overseer Lysetta have been corrupted by praetox and a dark disease that twists their minds. After dealing with a series of threats and would-be usurpers, the Guardian is told that Kaylee has finally succumbed to the dark curse and is forced to kill her and the forces that started the series of attacks.