The history of the Forbidden Universe is one that this known universe has suppressed to the point that only a few knew of its existence.
It was said that the Forbidden Universe was once supported by the Heavenly Laws. They had rules and followed standard procedures like everybody else.
However, one day, the Heavenly Laws rebelled against something and started handing out secrets that shouldn't be told to mere mortals.
Weak, talentless, and hopeless people suddenly became warriors with unimaginable powers.
In a short time, the laws became undone, and mortals started setting the rules.
Skills that should not be handed to mortals were given to them, and with a flick of their hands, stars and planets would shatter.
It got so bad that people from this known universe started adventuring there in hopes of finding something that would change their destinies.
