After gaining entrance to Blackstone Keep and recovering the legendary Thinblade, Alexander must seek out the Sovereign Stone, and quickly.

Contained within the ancient teardrop ruby is the secret of Wizard's Dust, the source of magic and the one thing that will ultimately decide the final battle of the Reishi War. Prince Phane will stop at nothing to lay claim to the Stone and with it the world.

Sovereign Stone is the story of Alexander's struggle to retrieve the Stone from the aether where it's been lost since the Reishi Empire fell 2,000 years ago and prevent Phane from learning the most dangerous secret in the Seven Isles.