The StarScourge is a sword created by Noriko Null by using the Keys of Heaven.
The sword’s blade is an access point to a pocket dimension of nearly infinite mass: anything touched by it is instantly absorbed, an effect similar to a black hole but with no gravitational pull.
All kinds of matter and energy are absorbed at an exponential rate; the only thing that prevents the sword from swallowing an entire planet is a constant adjustment of the fields holding it together.
This requires so much calculation power that only a Nexus user is able to use it.
When not in use, the sword’s scabbard produces a powerful magnetic field that prevents the blade from absorbing anything.
Should the sword be dropped when unsheated, it is programmed to levitate thanks to a gravity generator included in the handle.
The sword can also be put in a “quantum lock” that binds it to a particular position, rendering it immobile and binding it to the gravity of the planet where it’s located: it cannot be moved by any amount of force that is also not sufficient to move the entire planet,
There seems to be no upper limit to the amount of matter or energy that the sword can absorb.
In order to be activated it had to absorb a significant fraction of a Gamma-Ray Burst and it would’ve consumed the entire parent star if not taken away, and it was able to fully absorb a sword of Degenerate Neutral Matter that weighted as much as a planet.
The blade also completely annihilated the Class-2 god Ares once it came into contact with him.
While Ares was severely wounded, Noriko Null was sure that the StarScourge would’ve been able to annihilate him even at full power.