Villain! I Once Protected the World, Now I’m a Demon

"I've guarded the Sea of Tombs for ten thousand years. I only had to make it through tonight, and the job would have been done!"

"Now, all that effort has gone to waste. A hundred billion demons have broken out of their tombs!"

"This is all because of you fools from the so-called Sixteen Great Families!"

"The Sixteen Great Families? Hahaha, the Sixteen Great Families..."

"You were nothing but brats my old master casually rescued..."

"I taught you everything you know!"

"How did the immense merit I earned protecting the world from demons for ten thousand years become yours?"

"When your sixteen ancestors received my divine weapons and inheritance, they knelt before me and swore to build a fortified city around the Sea of Tombs, stretching a hundred thousand li!"

"They swore that every generation, every descendant, would protect the Sea of Tombs!"

"But you not only broke your promise, you stole the credit for my master's and my achievements, deceiving the world and claiming fame for yourselves!"

"Now your descendants have even released a hundred billion demons just to seize my treasures!"

"And they turned my master's remains to dust!"

"Every one of you from the Sixteen Great Families deserves to die!"

"Even if every single person in the Sixteen Great Families paid with their life, it still wouldn't be enough!"

"Since you have betrayed your promises, don't blame me for showing no mercy!"