The Obsidian Tower

 "'Guard the tower, ward the stone. Find your answers writ in bone. Keep your trust through wits or war--nothing must unseal the door."' Deep within Gloamingard Castle lies a black tower. Sealed by magic, it guards a dangerous secret that has been contained for thousands of years. As Warden, Ryxander knows the warning passed down through generations: nothing must unreal the Door. But one impetuous decision will leave her with blood on her hands--and unleash a threat that could doom the world to fall to darkness.