Codex Anathema, vol. VIII: Rise of the Quori
Immense eldritch machines that produce the warforged, the Creation Forges have all been officially dismantled according to the agreements in the Treaty of Thronehold. The creation forges were first crafted by Merrix d’Cannith, but it was his son Aaren d’Cannith who perfected his fathers work and turned the forges to the creation of the warforged. For thirty-one years the creation forges churned out numbers of warforged through processes only scions of House Cannith fully understand.
Although the creation forges have been outlawed two still operate in secret. Merrix d’Cannith II, the grandson of the progenitor of the warforged, still runs a creation forge deep in the bowels of Sharn; however he performs creations sparingly, so as not to alert any outsiders to its presence. The other creation forge is located deep in the Mournland and controlled by the Lord of Blades. This forge was damaged either during the Last War or the Mourning, and so only produces warforged at a fraction of the rate at which it used to. It is not unusual for warforged to emerge this forge with deformities in either body, mind, or both.