It was irregular, it had seemingly infinite sides. It was a Rhombicosidodecahedron.
A structure in which exists in two dimensions at once. This structure follows the laws of physics of both universes. If the dimensions follow different laws of physics, than the teratus will most likely cease to exist, or follow no laws of physics at all.
The structure was massive and strange, it didn't seem to follow the laws of gravity at all. It was a teratus.