Bastard Son is Forming a Nation: Isekai Debauchery

A young child with an ordinary pedigree who went by the name of Bastard and lived in a courtesan palace stormed out of the kingdom's smallest city, proclaiming that his tale offered the only hope for redemption in this world.
He saved a child knight prodigy!
He saved enslaved elves!
He began his journey to become the greatest kingdom by passing through a destroyed city and rising to the position of kingdom, shaking the entire world with each step!
As the darkness gives way to night!
As God is unable to reach the abandoned world!
The kind that has fallen will eventually become the god's messenger!
He will become the fallen angel of the lost world!