The Demon Blood Sacrifice is a mysterious inscription pattern array that allows a human to integrate the innate Cultivation of a demon beast. It is such an importantly guarded secret that only a few pinnacle experts of the Demon God’s Sect might know of its true uses. Since a demon beast's strength is held in their blood, the array uses that blood as a medium to enhance the human's strength.
Since a demon blood sacrifice can only be performed with the willing aid of a demon beast, it very rarely happens. This is largely due to the animosity between humans and demon beasts, so using the Demon Blood Sacrifice has become a huge taboo and can easily lead to the deaths of all involved.
Depending on the power held in the blood, this can cause a large leap in the cultivation for the human that receives it. They also can use it to possess the aura and appearance of a demon. Ancient and Primordial bloodlines even have hidden power sealed in them from their ancestors. Once the seal is broken a person can reform their physical body and obtain the demon clan’s physique.
Nie Li is able to trick the Wu Yazi, a Primordial Bloodline Divine Blooded Raccoon demon beast, into forming a Demon Blood Sacrifice with him and Xiao Yu as a condition of gaining his help to enter the Void Illusionary Divine Palace.