The Blank Plain

The Blank Plain is an off-shoot from the main Universal Hierarchy.
==Physical Description==
The Blank Plain is a infinitely large flat plain of grey unbreakable land, with a grey sky, and faint magnetic field. The land is slightly darker than the sky and the whole place has a slight day night cycle, the sky takes 9 hours to fade to light grey and then another 9 hours to fade to dark grey. Shadows fall as if there was constantly a star at 20° north from the "top" of the sky.
The Blank Plain is mostly devoid of life, except for a 10 km wide circle known as The Habitable Zone where living entities can spontaneously appear, it is unknown where they come from and its incredibly rare for 2 from the same species to exist at once.
There are square holes in the ground that reveal a infinitely large maze-like network of cubic tunnels that always bend at 90° angles and often split into 2 or 3 paths, though it seems that its rare for them to bend/split up or down. The tunnels can vary in size, ranging from 5 feet to 1 mile long, with ones bending up/down usually being 528 feet/0.1 miles, and the ones bending left/right usually being 56 feet.
~5000000 miles north and ~1500000 miles east from The Habitable Zone exists a massive arch known as The Arch.
The Blank Plain is temperatureless, no matter your body structure or species it will always feel like room temperature.
==Unorganized Facts and Trivia==
Every 10 hours any living being inside has a 0.01% chance to be sent to The Sky Void.
== Effects ==
Rare fantastical mirages despite there being 0 temperature difference. The mirages usually depict your home, a friend or family member, or supplies.
==Life Cycle==
Unknown.