The Plasma Beam is a energy based weapon appears in Red Faction: Armageddon.
It emitts an extremely powerful ray which instantly melts structures and enemies. There is a slight delay before this weapon discharges. It is part of the Plasma Family which also includes the Plasma Cannon and Plasma thrower. It can be found in the single-player campaign immediately after returning to Bastion after destroying the infested water treatment processor.