Dark Blood Age - Chapter 753 - Fake Deity

This is a story of a modern man returning to ancient times, returning to a real world without any extraordinaryness, and slowly rising by relying on the ability to attribute all data.

- Description from novelbuddy

But now with hypnosis.

Empires rise and fall on the Yulan Continent. Saints, immortal beings of unimaginable power, battle using spells and swords, leaving swathes of destruction in their wake. Magical beasts rule the mountains, where the brave – or the foolish – go to test their strength. Even the mighty can fall, feasted on by those stronger. The strong live like royalty; the weak strive to survive another day.

After his death, Bern awakens 10 years into the past as the third prince of Kailis, the enemy country.