From the Start, I Merged with Black Dragon Tian and Mass-Produced a Million Gods and Demons

[Invincible! Overlord! Tyrant! Ruthless! No holier-than-thou heroine!] This is a world of Xuanhuang where countless races vie for supremacy, immortals and demons stand side by side, and gods and Buddhas open up the heavens. Chu Yuan, the overlord of the underworld on Earth, was struck dead by a bolt of lightning during a thunderstorm. His soul transmigrated into this world. His luck was terrible: he transmigrated into a male slave and cultivation furnace for the reigning empress of the Angel Divine Kingdom. From the original body's memories, he learned that humans, owing to their unique souls, were suited to be offered as sacrifices and used as cultivation furnaces. Oppressed by the myriad races, they were penned up like cattle and horses, then harvested generation after generation. Fortunately, Chu Yuan fused with the Supreme Blood Sacrifice System. From the start, he blood-sacrificed the Angel Empress and obtained the Ultimate Body, Black Dragon Heaven, along with an army of a million gods and demons! After successfully fusing with the Ultimate Body, Black Dragon Heaven, and summoning a million gods and demons, he swept across the entire Angel Divine Kingdom. All male angels were enslaved, while female angels were treated as cheap concubines, playthings, and commodities to be sold. The myriad races of Xuanhuang had gone too far! Chu Yuan swore a blood oath on the spot: within ten thousand years, he would lead billions of gods and demons to sweep across heaven and earth, blood-sacrifice the mighty among the myriad races, enslave all living beings, establish the Heavenly Court, and subdue the Primordial World!