Sometimes, when a Warforged embraces their construct nature and rejects the things that make them more human, they can undergo a kind of metamorphosis. Warforged Juggernauts are larger than standard warforged, with a heavier frame. They have adamantine plating, and their armour is covered in vicious spikes. Some think that this represents the ultimate expression of the warforged design, and certainly warforged juggernauts seem to be perfectly designed to cause as much damage as possible, whilst absorbing ungodly amounts of punishment.
Many warforged juggernauts fought on the front lines of the Last War, charging headlong into enemy ranks and crashing through their formations. Many soldiers, especially those that fought against Breland or Cyre will have stories of the havoc wrought by the juggernauts on the battlefield, how their charge was more effective than most cavalry charges at disrupting enemy ranks.