Kharzem Prison is but one of many Sphere Cubes that form into Kharzem Fortress. Kharzem Prison is Skyland's most secure prison, for holding dangerous criminals. No one knows exactly where it is, apart from a few members of the Sphere. No one can exactly find it because it constantly changes it position. However, the Hyperion had a map to Kharzem, wherever it is located. In appearance, Kharzem Prison looks like a large Borg-like cube with green lights. With the other cubes, it forms into a massive cube formation, where whole layers can uniformly rotate like a giant Rubik's Cube. There is enough space between the cubes for ships the size of the Monolith to go through. The center of Kharzem is hollow, the place where Mila was held.