Kamigoroshi no Eiyuu to Nanatsu no Seiyaku - Chapter 29 Forest of Rotting Souls (2)

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

The peerless Demon Lord had been reborn. He used a dragon blade to sweep away powerful enemies from every direction and traversed the entire city, attracting countless beauties.

The cycle of life is not infinite—except, perhaps, for Elijah.At 122 years old, Elijah lived a long and successful life—until he woke up as someone entirely new. Now, an anomaly in a mysterious kingdom sustained by magic, he faces questions about his place in a world that doesn't defy the laws of nature, but take them to an entirely new level.For over six millennia, this isolated realm of 300,000 citizens has thrived, its survival bound to the magic that nurtures its air, water, and food. Yet, some whisper that a kingdom refusing to expand is doomed to fall. How, then, has this kingdom endured?As Elijah uncovers ancient secrets, dives into treacherous cave systems, and grapples with the fatal flaws of magic, he learns the truth about existence itself—forces that shaped the cosmos. New alliances rise to confront an ancient plague, and the kingdom's delicate balance teeters on the edge of collapse.In this world, the vibrant hues of freedom and potential are mere illusions, like sunlight filtered through stained glass. Elijah must decide whether to shatter the illusion—or embrace it.————This novel goes into great detail about the ways of the people and how it will differ from the suspected outside world. What seems like a population of people who do not have much knowledge, show how they found their way by “feeling”, or by anecdotal(personal) evidence.

Earth Immortals are cultivated from a blessed land.