Tsundere Campus Goddess and Rogue Master - Chapter 26

A ritual gone wrong gave him the world's deadliest Class—now all he wants is blood.Zeth stole the most powerful ritual magic in the world from a mad cultist. A Class that's fueled by the blood of his enemies and human sacrifice. One that's illegal to use, punishable by gruesome death. And now that he has it, he's faced with a choice: hide away for the rest of his life from those who would hunt him down, or embrace the power, becoming the hunter to get revenge on the murderer that stole his friends' lives.For Zeth, that's no choice at all.His enemies have to die. And he plans to use every drop of blood, eldritch ritual, and demonic summoning he can to kill them.

After Reincarnating into Naruto World at the Warring State Era as an Uzumaki, Masahiko thought that he got a useless System. He lived for 48 years as a normal, below average Uzumaki Shinobi.

That changed when he finally knew how the system works the day of his 49th Birthday!

- Description from Novelupdates

A hundred years ago, Chen Qingyuan entered a forbidden zone called Sky Abyss, where his soul lamp extinguished, and everyone believed he had died. Today, although Chen Qingyuan has emerged alive from the forbidden zone, his cultivation has been completely crippled, and his spiritual roots are shattered. Faced with the remorse of lost love and the oppression of various sects, how should Chen Qingyuan proceed?“Chen Qingyuan, I'll give you two choices: one, marry me; two...”Inside Sky Abyss, there lives a girl in a red dress, with eyes like stars and a gentle voice.“I choose the second option.”Before the girl in the red dress could finish speaking, Chen Qingyuan decisively made his choice.(Main character with a dark belly + no system + humor + traditional fantasy + weak synopsis)