This weapon is generally only found in capture the flag maps. It is used to erect a huge translucent green cube that slows movement and firing through it to a slow crawl.
Once picked up, it remains in your hands as your only weapon, and you are not allowed to switch to another weapon until you use it.
To use it, press the primary fire button and it will be dropped and set. It immediately morphs into the huge green cube, and stays up for approximately three minutes. It disrupts all movement and firing through it, including instantaneously-firing weapons such as the shock rifle primary fire and the enforcer. It affect vehicles as well.