The Demon Realm's invasion of the mortal world is a slow process.
According to information from the Demon Slayer Bureau, one complete cycle takes a thousand years.
In reality, the collision between the two worlds begins even before the thousand-year mark.
The Divine Wondrous begin to emerge several years, or even a decade or more, in advance.
During this time, it is possible to communicate with an Evil God using special treasures and malevolent artifacts, and to use the Evil God's power to transport certain things across the realms.
However, the cost is immense and only small items can be transported before the Celestial Change. After the Celestial Change, it becomes much easier.
The Sect Leader of Luo Xihu's Cult of Evil was one such case.
He sold himself to serve an Evil God and obtained immense power.
Then, he recruited Cultists to offer the Evil God the things it desired.
Human flesh and blood, Spirit, or even faith and emotions.
