There are a few really off topic threads like this. Anyway what fictional weapon would you want to see become a reality it can be anything from whatever you want from personal weapons like a lightsaber, gauss rifle or power armor to something huge like a planet sized ship.
Personally I love mechs ( I've been playing titanfall a lot ) I've always thought those were cool especially ones that are really agile like metal gear ray or the gekkos. Although I have no idea how practical or advantageous something like the ones from titanfall would be in real life I don't care I want those to be real.
I should probably clarify that this isn't a competition to see who could pick the most powerful weapon I thought it might be fun to talk about fictional weapons.
Updated by Lekkiyo