Flowers from Bones

Cangwu Realm. This is an "end of the Dharma era" where spiritual energy is drying up. In ancient times, humans and demons signed a "blood contract" to coexist. However, a war a thousand years ago resulted in the demons being slaughtered. In order to maintain the circulation of spiritual energy, human monks began to extract the "demon marrow" from the remains of the demons as a training resource.