[Darkening System + Invincible + Extremely Satisfying + Unforgiving + Demon Lord]

Having guarded the Imperial Pass for a thousand years, all Qin Ziming sought was for his wife and daughters to live peacefully and for humanity to enjoy lasting peace.

Therefore, even though the system kept saying that turning into a demon would make him an emperor, he chose to ignore it.

Until her daughter Qin Yuan's blood-written letter flew in front of her.

"Father, where are you? Mother has switched to the path of ruthlessness and no longer wants Yuanyuan."

"They're so mean, they even tried to dig out Yuanyuan's bones! Daddy, Yuanyuan... I miss you so much!"

Qin Ziming was stunned. He had risked his life to guard the Imperial Pass, and yet they turned their swords against his daughter?

Guarding it for a thousand years, only to be met with ingratitude! If that's the case, let whoever wants to guard this Imperial Pass guard it! He returned to the vast heavens to seek justice, but all he received in return was endless insults.

On this day, he completely turned to the dark side, leading his daughter into the abyss of evil...

...

Thirty years have passed, and his daughter has grown into an empress, while he has become the Lord of the Demon Abyss, feared by all.

On this very day, all races broke off relations and invaded, and the heavens were completely overrun.

Those old acquaintances panicked and began searching for him all over the world, weeping and begging him to send troops to quell the unrest once again...