Nali Weapons 3 is a new weapon pack for Unreal Tournament, containing over 15 new weapons, including nuclear weapons, drones, freezing and flaming guns, and the list goes on... It's also the sequel to the old Nali Weapons II X.
It casts a lightning storm for about 30 seconds (configurable). The lightnings may or may not hit the opponents directly, but if they land nearby they may still kill.
I have to say that the screenshots do not reveal that much of what is really going on in-game (effects-wise, as the electrical activity is a lot more intense than what's portrayed here and aren't meant to be seen as still images). Soon I will make a preview video on this and the other oversurrections.