Before the world was born, there were two gods. As you can imagine, one is a deity, the so-called God Jehovah. The other one is the devil Satan. They themselves were sinless until after the creation of the world, when sin began to take hold. Sin arises from what they did or what the creatures they created did. Jehovah is very worried that in the future these sins will cover up the good things in the world. The power of sin is very powerful, and once accumulated, it will even control God's consciousness. So He created this creature, the Son of Atonement. The mission of the Son of Atonement is to help God atone for sins. Sleeping in the lake of sin, the soul is burned by the most poisonous karmic fire in the world, suffering all kinds of torture and pain. It is not until the atonement is over that one awakens and is liberated.
The more sin God creates, the more painful the Son of the Atonement will be. But Jehovah thought this was too cruel, so he set a time limit. Within a thousand years, if the son of the atonement has endured the sins created by God during this thousand years, he will be able to wake up. Therefore, whether and how long the Son of Atonement can awaken within a thousand years depends on the amount of sin created by God.
Jehovah made a total of two sons of atonement. He made them beautifully with great care, but his brother Satan dismissed them. Satan believes that sin does not need atonement and that he is not controlled by his sin. Even so, Jehovah still gave him the atonement son of Satan. Satan decisively threw him into the lake of sin in the devil world without seeing him.
After that, the creature was never remembered. The crimes committed by the demons are many times more than those of the gods, and the demons have gradually become synonymous with evil.