Kamigoroshi no Eiyuu to Nanatsu no Seiyaku - Chapter 23 The Heroes and thereafter

Xiao Ran transmigrated to a fantasy world. As a dungeon guard in the Celestial Dungeon, with a special floor called the Purgatory meant for powerful demons and martial arts experts, he faced a huge challenge from the start. The Eldest Princess acquired a forbidden martial arts technique and was banished to the Purgatory. However, no one was powerful enough to restrain her. All the dungeon guards were defeated. Xiao Ran stepped up and declared, “Your Highness, it’s better for you to behave yourself on my territory” and effortlessly subdued the Eldest Princess.

He progressed from imprisoning the Eldest Princess to delivering the Great Xia Kingdom from the evil clutches of various demons and evil martial arts experts.

…

Xiao Ran was the mastermind behind the scenes.

An unexpected discovery in Machu Picchu has transported a young professional thief from Earth to a world filled with mystical powers and evil plots. With his beloved teacher and best friend killed during the calamity, his only goal is to become stronger, so that he can take revenge for them.This is a novel filled with politics, the struggle for power, evil beauties, and of course, Divine Immortals.

- Description from Novelupdates

Five years have passed since the Elves invaded Earth.

The poor and criminals of the Republic of Ascaria are forced to join the ranks of the soldiers on the front lines while the rich and high-ranking government officials hide behind walls.

Erend Drake is a young man who must go out and fight so his family can live in a squalid shelter within the walls.

One night in the battle Erend had to die because he was killed by the Elves.

But suddenly he wakes up the next day with a mysterious power.

[Congratulations, you have been chosen to be the holder of Systema.]

[Please choose the available skills]

[ Dragon Armor ]

[ Dragon Claw ]

[ Dragon Eyes ]

[ Dragon Wings ]

[ Fire Breathing ]

Erend did not expect that he would become a Dragonborn. The strongest race feared by the Elves and the humans.

“For a long time, we humans have been like the chosen race, without any natural enemies, and have long been at the top of the food chain. Unfortunately, I have to tell you...” “When there is only one bird in a forest, then the forest is basically fake, and the bird was put there by someone...” “No matter how a fish swims, it can never meet any of its kind, which only means that the fish is kept in a fish tank...” “Yes, we are the birds in the forest and the fish in the tank.” “Yes, the world we live in is virtual!”