Beam Saber

This Sword, Forged from a mix of Gundanium and Unobtainium, emits a beam of light, though a process of Hydrogigntion, which, in a nutshell, magnetizes Hydrogen atoms and ignites them. The Slicing power of the blade increases as the number of magnetized Hydrogen atoms increases, and the wielder has TWO (2) of them, which can combine to form a bigger dual blade.
While this is effective in a NUMBER of ways, this also runs the risk of causing the extinction of all life on whatever planet or galaxy this blade is in, KZG Gundam never uses it except as a last resort.
An ideal place to utilize this blade would be in space as the number of dead stars can supply more than enough Hydrogen to fuel the needs of this energy- (and possibly life) consuming beast of a sword.