Became a Demon King by Offering Sacrifices

(Dark story, no heroine, decisive killing!)

Rebirth in another world to obtain the sacrifice system:

Sacrifice the blood-clotting warrior and the iron shirt will be perfected!

Sacrifice the bone-training warrior and achieve the Golden Bell Cover!

Sacrifice the innate warrior and achieve the great success of Hunyuan Gong!

…

A few years later, Zhou Hao looked at the system panel with insufficient sacrifice value and set his sights on the righteous warriors again...