The Cube is a Mysterious, Unknown Construct floating in the End constructed by a unknown Entity/Species. Not much is known about the Cube other than the fact that it's mystery is similar to the Structure. There is a theory that The Cube was Constructed by whatever created the Structure. There is a specialized team dedicated to researching and documenting more about The Cube. Oddly the cube appears to have no defined size as though built out of some sort of semi-solid expanding gas. Day 10109 of their research, it appears The cube has been generating energy from a imprisoned cosmic entity .