The Mainverse is the name given to a large universe that collides into several others during the events of Umbrella Waffle.
It contains a number of planets, many of which show signs of advanced life and are home to such inventions as the Astral Arbalest. Most of these planets are covered in elaborate ruins, often beige in color and sporting large cracks if not already broken to pieces. For now, most of the planets have a serious Viler infestation.
Near the center of the Mainverse is a humongous Sun whose light is visible from almost any point in space. There also seems to be a weak form of Wi-Fi throughout the universe, but it is unknown how this could be.
Many gods are known to inhabit the Mainverse; they can be visited via a process called ascension, though any specifics of this process remain largely unknown for now. There is no other way to get in contact with them.