Rasputin is a Warmind built to defend Earth during the Collapse. He is the only Warmind known to have faced The Darkness and survived. He protects something deep below Old Russia that the Fallen House of Devils desire to retrieve. He also began connecting to AI that were formerly controlled by other Warminds across the Solar System.
In The Buried City, the player's Ghost mentions that "He's everywhere now" at the end of the mission while analyzing a machine.