Re:Zero Kara Hajimeru Isekai Seikatsu - Chapter 14Arc 8, - “The Kingdom and the Empire”

This is a very interesting thing. It is obviously dim and black, but it can emit a golden light, which makes people deeply fascinated by it…

- Description from novelbuddy

The youngest Wiseman of the continent, Chu Tian, has traveled 30,000 years back in time to the age of antiquity due to an accident.

This is a prosperous era. Rare herbs, minerals, treasure relics and monsters can be easily found throughout the land.

However, this is also an undeveloped era. Communications, traffic, martial arts and technology are in its early stage of development. Prosperous cities lack lighting while its citizens are uneducated.

Our decisive MC using his future knowledge creates Magic powered light bulbs, magic powered telephones, magic powered cannons, magic powered computers, artificial intelligence, psyche internet. 30,000 years worth of knowledge allows him to create miracles and shine brightly in this era. Allowing him to conquer the land and sit firmly on the throne of the 10 realms.

- Description from Novelupdates

A magical 'Universal Toolbox' led Joe Ga into the arms industry.The complex and unpredictable nature of the world caused Joe Ga to gradually change his goals...“Sir, how did you end up here?”“I don't know, I just wanted to make some money at first, buy a house, marry a wife. But slowly, as more and more people appeared around me, my goals started to change.”“So what are your goals now?”“Now, I just want to retire peacefully with my guys, really!”

25 years ago, Gu Yuan who had a terminal disease was found to possess one kind of kind rare powerful gene.
In order to allow the gene to pass through the generation, she donated out 5 ova before the failure of her surgery.

25 years later, today she awakens. Her 5 ova had now turned into outstandings and famous men.
Mmmm….who is it that laughs at her for being old-fashion, backward, have nothing at all and penniless?

The world-renowned tycoon prince accompanied Gu Yuan for supper. The media was in an uproar, is the prince going to be in love?
Tycoon Prince: That’s my mother.

The media tycoon who controls the world public opinion, stake a thousand pieces of gold on one throw for Gu Yuan. The whole audience was in an uproar, an unknown girl going to marry into the noble family?
Media Tycoon: That’s my mother.

The film emperor with thousands of fans who received worldwide attention broke his 8 years practice and for the 1st time ever unexpectedly composed music for Gu Yuan. The whole internet was in an uproar, is this film emperor’s love of the century?
Film Emperor: That’s my mother.

17 years old beautiful young boy genius with IQ that beyond compares named the asteroid he found after Gu Yuan. The world was in an uproar, is this love between an older woman and a young boy?
Genius Boy: That’s my mother.
……
All the supporting males and females who had ridiculed and bullies Gu Yuan before cried: She actually has how many good sons?!

Finally, when the handsome world most eligible top billionaire accompanying Gu Yuan for shopping, the crowds immediately shout loudly: She must be his mother! His mother! His mother!
The aloof top billionaire: She is the mother of my sons.

- Description from Novelupdates