A directed thermite pellet. Anyone seen a DIY version of this? All videos I've seen have just been thermite on top of something burning through to the ground.
What do you need it for? Civilian uses of this tool seem pretty limited. It might help you open a locked door, but at the expense of the door, whatever's behind it, and maybe even the entire building. A regular oxy-acetylene torch or a thermal lance are probably better tools for any sort of practical civilian application.
So, a blow-torch then. Not a light sabre.
Nothing [apart from click-bait] to see here. Move along, please.