Paladin of the Dead God - Chapter 86:

A college student, accidentally reborn into the world of Naruto, becomes a member of Uchiha who is destined to be exterminated.

In this cruel ninja world, in the face of endless wars and exclusion from the village, what will Uchiha Qing do?

PS: Later in the book, the protagonist will develop a system of immortal cultivation. Cultivating Immortals in the Ninja World, have you seen it?

- Description from novelbuddy

Auren was the star of his generation. Graduated the combat school at the age of 12, mental fortitude was beyond his peers, and he was considered the talent of the Western State of Lysendral.It was for this reason that his awakening was greatly anticipated. Everyone was sure the star would receive a Divine Blessing from the Archon.And like others before him, be set on a definite journey to becoming the strongest Blessed in the history of the world.However, expectations were shattered when Auren awakened a Divine… Curse.“Such a phenomenon has never been heard of!”“How can a human awaken a curse! This is an abomination! Kill him! Sacrifice him to the archons!”In such a slight moment of appointment, Auren's entire life came crashing down.And he became a national criminal. Locked up and sentenced to death for having receiving a curse instead of a blessing.A 16 year old boy was ruthlessly killed by a guillotine and offered as a sacrifice to prevent doom… and the people relished in it.However, this was not the end for Auren.[Congratulations, you have died by execution],[Conditions have been met][You have challenged your first fester.][A requiem beckons onto you..][...Your resurrection awaits.]Having broken the shackles of death, Auren rises again to seek vengeance and destroy not just the nation that had killed him but tear down the very existence of the archons themselves.But is everything really as it seems?

Michael was suddenly reborn into a another world by a God because of an accidental death. To make up for this fact, the God gave him another life in a fantasy world of swords, magic, and monsters.Unfortunately, it turned out that the world he was reborn into was still stuck in the medieval times. It didn't have electricity, it didn't have proper plumbing, and it didn't have any technology that he was so used to back in his old world.But thanks to the God's blessing and an AI assistant called ChatJK1, he was given the power to MAKE his life comfortable. Slowly, Michael transforms this new world into a place even better than his previous one by taking ideas from the modern world and putting it in this world, with the added bonus of magic.

I finally managed to kill the demon lord.