The Shade Realm of Matter is a Realm associated with the planet Jupiter. Unlike the normal realm, which is mostly empty space flecked with planets and other hunks of matter, the Shade Realm of Matter is an infinite mass of soil- and stone-like matter studded with bubbles of empty space that resemble Hollow Earth. In fact, one theory about S. R. Matter is that Hollow Earth is located here, rather than in some kind of Inner Umbra, along with a Hollow Realm corresponding to each of the Shard Realms. A Hollow Mercury has been identified, and several groups of mages are working to locate additional Hollow Realms.