The Exorcist - Chapter 37Book 7: : Boy and Girl

Want to get super vision? Then let’s get some eagle blood.

Want to get super power? Blood of the Bear works great.

Are you going to surpass humans? Exactly, I have vampire blood here.

Do you want to be the ultimate creature? Very well, I have a drop of the blood of the ancient gods here.

…………

Become the headless mayor of the ancient, chaotic city of Arkham, where the gods breed.

Starting from blood therapy, Ross built an extraordinary shelter, a forbidden library, and a museum of the ancient gods.

Ross: We Arkham are full of talented people, and our folk customs are simple, hey! Don’t run! Haven’t visited Arkham Sanatorium yet!

Farming flow, invincible flow, behind-the-scenes black hand flow, Cthulhu.

- Description from novelbuddy

In regards to the MMORPG Cross Reverie, Sakamoto Takuma boasted an overwhelming strength that was enough for him to be called the Demon King by the other players. One day, he gets summoned to another world with his appearance in the game. There, there are two people that insist “I am the real summon master.” Takuma gets slave-turning magic used for summoned beasts cast on him by the girls –

In the 21st century Earth gave Birth to greatest genius ever. A genius who Master myriad of arts. Medicine to Engineering. Mathematics to Micro Biology. Weapon Designing to Environmental control. Music to Painting. Dance to Martial arts. He mastered Everything.

The real hardcore player, who chose the most difficult start in “Reality Online”, still has to shock others with his god-level operation.