Reborn as the Demon Venerable, I Am the Calamity That Ends All Calamities

A hundred years after the Demon Lord Ye Chaoge was sealed away, Ye Huaiyu, eldest son of the Tai Xu Ye family, summoned him with a sacrificial soul-calling ritual and demanded that he find the Yellow Springs Mirror within seven days. The mirror concealed a secret about the Immortal Venerable and the Human Emperor. Following the trail to a blood-pool technique in Jiangnan, they discovered that the root of the calamity lay in the capital.

Slay the Human Emperor, establish the Mandate of Heaven, and purge the rot for the sake of all living beings.

(Ye Huaiyu: What the heck is a blood pool? I thought it was a speed bump.) (Book title: Relics of the Broken Sword)