Ryza

Ryza, also known as the “Furnace of Shackled Stars,” is an Imperial Forge World of the Adeptus Mechanicus that is located in the Segmentum Ultima of the galaxy. The planet is home to the Titan Legion called the Legio Crucius, known also as “The Warmongers.” During the Horus Heresy, a great battle took place on this Forge World, known as the Defence of Ryza. Forces of the Dark Mechanicum, led by the Traitor Titan Legions and their Chaos Knight allies fought against the Loyalist servants of the Omnissiah. Countless Titans and Knights fell on both sides. Eventually, the Loyalists were able to drive back the Traitors, only to be bombarded by a Chaos Warfleet from orbit.