Re:Zero Kara Hajimeru Isekai Seikatsu - Volume 4, Chapter 6 [Along The Road To The Sanctuary]

While the demons were rising, mankind was about to become extinct. Six temples rose and protected the last territory of mankind.

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

He went from an ordinary student to a god-level master in manufacturing.
Continuously progressing, processing range from hundreds of meters to tens of atoms, processing precision from microns to nanometers to atoms and molecules, everything was possible.
Wassenaar Accord? The embargo against China? What we have banned are technologies that China doesn’t care much about. Most of the member states have to import technology from China, shouldn’t the member states have a meeting to discuss and bring in China as well?
Forbidden chip sales? Is there a mistake? We barely managed to maintain our low-end market with a large amount of subsidies, it’s already good enough that China didn’t initiate an anti-dumping investigation. President, are you sick?
Hmm, it seems like living cells can be processed precisely as well. Do you need to refine the cancer cells that you are spreading out?

- Description from Novelupdates

Aron was a child of the unorthodox beast monger race that thrived in what many considered hell itself, Limbo. A place full of chaos, death and misery where only the strong, cunning and cruel survived.

Follow Aron’s vicious journey as he faces the most dreadful of beasts, the most talented of humans, and many other races for their power and territory, all for the sake of pursuing knowledge and true understanding of Limbo and the secrets it holds.

An existence that grows to be feared, respected and even worshipped by some wherever he goes.

This is the bloody tale of Aron Limbo.

“Why would I do something that doesn’t benefit me? Be selfish and be cruel because life will never take pity on you. If you can’t accept this truth then you and I walk very different paths.”