The Blood Devouring Demon Exalted is an extremely powerful cultivator from the Ancient Era who has achieved undead status by fusing with cultivators of the modern era with a specific divine body (Four Fiends Divine Body) and hence increasing their martial cultivation, which in turn restores the Blood Devouring Demon Exalted's cultivation to the True God stage which allows him to live forever. He is currently in the process of fusing with Wang Qiang.
Volume 8- Battle of Prophecy
Unfortunately for him, Chu Feng ended up passing the test of the Sacred Tree, meaning Chu Feng was chosen as the one who would fuse with the Void Sacred Tree.
As a result of this complication, the Blood Devouring Demon Exalted then decided to forcibly extract the power of the Void Sacred Tree that had completely fused with Chu Feng's blood and soul. Ultimately, he was stopped and almost killed by the protective formation left in Chu Feng's body by Chu Xuanyuan. The Blood Devouring Demon Exalted then proceeds to explain that the Void Sacred Tree is the power of a God, which is a being whose power far surpasses that of a True God.