The Nullscape, also known as the Void, is a non-physical realm that resides between different realities. It is not known how or why entities end up here.
The Nullscape is best described as a chaotic sea which is always changing in nature. There are very few stable "islands" within it. It's structure is akin to a circular maze, where the Void sits at the center, and all other realities reside at it's various but elusive exits.
Given that the Nullscape is constantly shifting and expanding, means of effective traversal are few and far between. Voidbound creatures are able to travel through Void tunnels of their own making, but for other entities, the next best mode of travel are Beacons, anomalous rips in reality that can transport anything that enters across great distances. Going back to the maze analogy, Beacons can be thought of as a tool to break through the maze's walls in hopes of finding an exit -- one's home reality. This has yet to be proven true, though.
While the Nullscape is non-physical, things like hunger, pain, and death are still very real. Flora and fauna compete to survive within this ocean of chaos -- all except Robloxians, which describes a peculiar set of Void denizens.