The setting of the Demon World is the second focus of this book:

The level differentiation corresponds to the Holy Spirit Continent, which are the Demon Soldier Level, the Demon Warrior Level, the Great Demon Warrior Level, the Demon Spirit Level, the Demon General Level, the Demon King Level, the Legendary Realm, the Demon Sacred Domain, and the Demon God Domain. Before Jia Ming was reincarnated, he was the overlord of the Demon Sacred Domain (corresponding to the Holy Spirit Continent's Holy Domain).

Supplementary lifespan description: (It's just the situation between the Holy Spirit Continent and the Demon Realm, and other shijie people have different lifespans, which will be introduced later)

Generally speaking, after initiating the spirit at the age of 10, the ordinary monk can complete the spirit building before the age of 18 and complete the spirit gathering before the age of 30. After gathering spirits, the speed of cultivation began to decrease greatly, and many people could only stay in the early stage of the spirit gathering realm for the rest of their lives. In the early stage of the Spirit Gathering Realm, the lifespan is about 150 years old, but if you can continue to break through to the middle stage, the lifespan can be extended to more than 200 years, and in the later stage, you can have a lifespan of nearly 300 years, and if you can break through to the Spirit Refining Realm, the lifespan can continue to increase.