The Sinful Path.
It was until he and the system got here that they learned about the many purposes of the void universe and why the Supreme decided to imprison ANNIHILATION instead of banishing it from the Cosmos.
The system discovered that while the main purpose of the void universe is for it to be a prison, there are two other purposes that are highly possible. One of them is to find a way to become an Absolute. That is the purpose of the path of demons.
The lord of Madness could edit a whole universe and implant his code in it, but he couldn't do that to an Absolute despite being strong enough to imprison it. So he resorted to creating beings from its refined blood.
Those beings are demons. They are the fusion of the path of Madness and Annihilation. They are truly a sin.
From what the system has deduced, demons were supposed to grow until they became limitless and achieved Absolute power. He can't even begin to imagine just how powerful demons like that will be.