Alka didn't understand demons, nor did he know much about the so-called Abyss; his knowledge of the Abyss and demons came from entertainment works in his past life.
Although there were some similarities between the two, they were obviously completely different things.
In this world, the Abyss is akin to a relatively powerful Plane World.
This plane has awakened a consciousness, supposedly the will of one of the original Creator Titans who died.
After his death, the world he created gathered around his body, being stained and corrupted, forming the first Abyss.
The essence of the Creator Titan was to create and die, his remaining will still wanting to create worlds, but he was obviously powerless.
Such days gradually mutated into grabbing, plundering, merging, devouring.
Turning other normal, intact worlds into parts of the Abyss.
Thus, the Cancer of the Star Realm was born.
Of course, this is just one theory of how the Abyss was born.
