Source: Alien Archive 2, pg(s). 108-109
Siege robots are intelligent robotic heavy tanks armed with multiple weapons and enough ammunition to fire a sustained barrage for minutes. Additionally, their nanites can repair them while in the midst of a battle, and their thrusters allow siege robots to hover a maximum of 10 feet above the ground, or to fly in a vacuum. A siege robot can carry up to four human-sized passengers, but provide them no cover.