

From the healer Xod he gains the idea to use metals to create a serum against phthisis. Yawgmoth convinces Halcyon's elders to give him more funding and apprentices to study the disease.

Gix escapes upon hearing this, wanting vengeance for his people. Yawgmoth discovers that the powerstones on which all the technology of the Empire is based upon cause phthisis, and that the Untouchables get the disease from the Mana Rig which is based on top of the caves. He brings Gix to his laboratory and studies him and Glacian. Yawgmoth discovers that most of the Untouchables, Thran who were banished to the Caves of the Damned under the city, are also suffering from the disease, which he names phthisis: a Thran-based word meaning "continual degradation". His wife Rebbec uses her influence as the city's main architect to recall the exiled eugenicist Yawgmoth. Glacian falls ill and can't be healed by the Thran healers. Then the story goes back 9 years in time, when the brilliant artificer Glacian is stabbed with a powerstone by the Untouchable Gix during a riot in the Mana Rig. The book begins with telling the beginning of the Battle of Megheddon Defile, where an alliance of dwarves, minotaur, cat-folk, elves, Viashino, artifact creatures and humans called the Thran Alliance marches through the Megheddon Defile against the city of Halcyon from which Yawgmoth attacks them with Phyrexian creatures. The first three parts then go back in time to tell the events that lead to that war, the final part continues where the first chapter left off, chronicling the end of the war. The book is divided into 4 parts, each starting with a chapter telling events of the Thran-Phyrexian War. This book tells the story of how the mighty Thran Empire fell to internal struggles started by a lowly healer who would grow to become the god-ruler of Phyrexia and the greatest danger to Dominaria in history: Yawgmoth. But amid this civilization, a shadow took root, one that would stretch its arm across space and time. They built machines and artifacts, the likes of which have never since been seen. Before history itself, the plane of Dominaria was ruled by the Thran.
