The Null Sword is a powerful weapon created by the Archons. It is made of a substance similar to dark matter where a containment field forms it into the shape of a sword. When it comes into direct contact with any sort of matter or energy, it completely obliterates it. As such, it has the capacity to kill gods in a single strike. The Null Sword however is incredibly dangerous to use. Collateral damage is frequent. And if two Null Swords ever cross blades, it creates a dark matter supernova that can obliterate entire star systems. It was for this reason why all but one of the Null Swords were destroyed.