The Antimatter Cube is an extremely unstable multiversal object that rapidly depletes energy from the planet it is found on. Previous manifestations of the Antimatter Cube have historically been perceived as extremely valuable to intergalactic empires for its use defending against Trisolaran invasions.

The Antimatter Cube has been discovered in the center of the B-12 universe. The Antimatter Cube is to be contained via extraction from a Spacetime Rip.