Warmind is a type of high performance artificial intelligence that was built for strategic warfare. A vast number of his warminds were prevailant during humanities Golden Age, prior to the events of the Collapse.
One of these warminds was Charlemage, constructed using the ancient power of Mars. This specific warmind was held in a facility known as Charlemagne's Vault, a facility that has since fallen under the control of The Cabal. The Guardians were sent to retrieve a shard of the warmind for an unknown purpose.