The legendary AirSword, in code that is visible (but not recommended to be viewed). The AirSword (along with its partner, the Hot AirSword) is indeed the most powerful weapon known to MineTest. It can dig almost any block quickly and with ease (with the exception of the cottages mod's wagon wheel, still trying to work this out).
For most mobs and players, this is a one-hit-kill weapon.
See forum topic for details.