The most dramatic weapon during World War 1 was poisonous gas. This was because it wan't even known when released, so when your buddy next to you just started dying all of the sudden. That would scare you and you would start crying because there was nothing you could do to help him. Then you would die later from the gases too and there was no hope of saving yourself from death.
In order , chlorine , phosgene and mustard
the tank
The tank and the automatic rifle and grenades and larger mortar fire are the most dangerous weapons. The most dangerous chemical weapon was the mustard gas the Germans used.
In World War 2 the Germans introduced the V2 rocket, a terrifying new offensive weapon. In WW1 poison gas was considered the most terrifying weapon.
The cannon. If you mean powerfully based on accuracy then the rifle.
The labor union's most powerful weapon is the strike.
the most powerful weapon is the lost katana it is +110
the most powerful weapon is the supernova lvl 99. that is the mega version of the harbinger
The U-Boat
The weapon of the King of the Gods, Zeus, had to be the most powerful. Otherwise, he would be overthrown by the other gods. Thus, it was his thunderbolt that was the most frightening weapon.
a nuke
canyon
A thermonuclear warhead
the cannons
power and the government
In order , chlorine , phosgene and mustard
France is part of the "nuclear club" so we would assume that the most powerful weapon in France is some kind of Hydrogen bomb/warhead.