The Bloody Demon Church was the master of all the other deviant sects over a thousand years ago, being very powerful at the time. Later, they were destroyed by the Center Sect and other orthodox Cultivation sects working together. But even now, their influence could still be felt.
Many magic treasures and secret methods of the Bloody Demon Church were left behind. Their magic treasures became the guardian magic treasures of many deviant sects, and likewise, their magic methods became the main secret methods of many deviant practitioners.
These sects considered themselves as the authentic inheritors of the Bloody Demon Church; it seemed as if they could obtain a high status in the deviant circle by claiming so.
The Dace Devil Pill Liu Shisui ate had a secret method attached to it, which was one of the secret method left behind by the Bloody Demon Church and was the magic method of the highest level, called the "Bloody Demon Method".