Infinity Arms Vibro-Sword...
The blade is a Zero-G grown mono-crystal. Flick the switch and a
high speed oscillation is started within the blade. Within seconds the
blade is vibrating at near gigahertz rates. With a minimum amount of
force the sword can cut through virtually any substance. The external
power cable would attach to a suit of powered armour or back mounted
energy cell. Brought to you by... INFINITY ARMS!