A Reincarnated Mage's Tower Dungeon Management - Volume 6, Chapter 7 – Princess Adele Appears!

When necromancers perform a great ritual to summon an undead servant, they bring a powerful vampire into their world. And now, their fate is sealed as food, but for Klaus, this is just the beginning of his adventure. In a cruel world where people will do anything for power and immortality, he is already very strong and immortal, so what's left if not start a family and have fun stepping on arrogant people through the way?

The first-ever virtual reality game, New World. {The time has come.} {Synchronization starts.} That marked the beginning of the catastrophe. As the game became reality, the Earth began to crumble. However, there was hope. All-Master Jeong-hoon, who had survived until the very end, was just one step away from finishing the game. “Gah!” But ended up being betrayed by his comrades. “Should I say, from the moment you said you wanted to end this game?” The reason for their betrayal was simple, if the game ended, their power would disappear. The moment they thought it was all over. [An unknown mysterious force is protecting you.][An unknown mysterious force is sending you back to the past.][Warning! The system attempts to intervene… failed.][Warning! Warning! The system attempts to intervene… failed.][Warning! Warning! Warning! The system attempts to intervene… failed.][An unknown mysterious force dissipates.] Thanks to that unknown force, he returned to the past.

What is it like to own an abandoned oil town in the West? At first, Xu Xing simply wanted to provide some convenience for travel enthusiasts and camping enthusiasts traveling by car to the northwest.

However, it has been out of control since then…

The stall has been upgraded to a convenience store with a unique style, the instant noodles cooked in an earthen pot have been transformed into a restaurant that provides hot and authentic beef noodles, and the shack has been transformed into a hotel that is unique in the country and can look up at the deep starry sky. The tire point has been upgraded to become a gas station and maintenance station….

after that,

The town unknowingly became the size of a small county town…sixth tier, fifth tier, fourth tier, third tier…a few years later it became the only new first-tier city in the northwest Gobi Desert…

- Description from novelbuddy

There was a mysterious old man who approached the failed swordsman with the “100 million years button”. A magic button which can achieve the same effect as training for 100 million years if you push it.

The failed swordsman who pushed the button had his doubts, but immediately felt tremendous power rising in his body. So he pushed the button many times.

However it was a cursed button. The moment it was pushed, he was confined to the 100 million years prison of time. The first 100 years were devoted solely to training. After 1000 years he had forgotten why he swung his sword. He stopped thinking completely after 10,000 years had passed. After 100 million years he became crippled and finally managed to return to the real world. At the same time losing all his memories from the past 100 million years, the only thing that remained were his sword techniques. “I can become stronger just by pressing the button!” or so he thought and pushed the button many times after that. Foolishly trapping himself in that 100 million years of hell each time.

As he continued this loop, he began to think “If I destroy this world, will I get out of here?” A few billion years later, he finally escaped from the loop.

This is the story of a failed swordsman trying to make a name for himself in the world.