[quote=Bosco]
Black Plague- Sounds like you are going from a unit 1 dagger or small melee to a unit 2 standard melee or a powerful melee
[/quote]

http://starwars.wikia.com/wiki/Vibroblade

This is the basic principal that I'm going for, but I'd have to edit the design a bit to make it more affective against metal than flesh.