In the 41st Millennium the Leman Russ Conqueror is an uncommon sight in most Imperial Guard regiments as the STC designs used in its construction are found only on the Forge World of Gryphonne IV. The original designs that were recovered on Gryphonne IV now reside on Mars waiting to be processed for distribution across the Mechanicus' manufactorum network and at present there are several other Forge Worlds lobbying to gain access to them. The Leman Russ Conqueror is well-liked by its crews due to its speed, mobility, and high rate of fire, and it has unofficially became known as a "breakthrough" tank because of its common tactical deployment by Guard commanders to exploit gaps in the lines of enemy armour.