preface
The Eighth-Level Immortal Emperor was the top combat strength in the Immortal Realm, after all, there were very few Nine-Level Immortal Emperors in the Immortal Realm, and the Strongest Immortal Emperor was only the level of the Eighth-Level Immortal Emperor, so the Eighth-Level Immortal Emperor was very domineering. Because of this, Emperor Yu's style of conduct was very strong, and everything in his territory, Emperor Yu took the form of plunder.
However, according to the division of the combat strength level of "Star Change", the eighth-level Immortal Emperor is a small minion, not to mention in the Divine Realm, that is, in the Immortal Demon Realm, the Eighth-Level Immortal Emperor is not enough to see.

First, the origin of the Immortal Demon Realm
The Immortal Demon Realm is a more general statement, in fact, the Immortal Demon Realm is divided into two major areas. After hundreds of billions of years of development, the Ascender forces occupied 70% of the territory of the original Immortal Demon Demon Realm area, while the native forces of the Original Immortal Demon Demon Realm only occupied 30%. It wasn't that the combat strength of the native cultivators was inferior to that of the Immortal Demon Realm, but the number of ascendants was too large, and the native cultivators voluntarily gave up 70% of the territory in order to balance. I have to say that the local cultivators have a very high level of consciousness and know the way of balance.
In order to make it easier to distinguish, the territory of the native cultivators was called the 'Dark Star Realm,' and the ascendant forces were called the 'Immortal Demon Realm'.
Second, the top combat power of the Immortal Demon Realm
Because the protagonist Qin Yu is classified as the ascendant side, and because the territory of the ascendant side is large, the Immortal Demon Realm has also become a collective name for the Dark Star Realm and the Immortal Demon Realm. As a local force, the three emperors of the Dark Star Realm were powerful in battle, each of them was a peak ninth-level immortal emperor, whose physical strength was comparable to that of an artifact, and he also had a spiritual treasure. Therefore, the top combat power of the Dark Star Realm was stronger than that of the Immortal Demon Realm.
The strongest combat power in the Immortal Demon Realm is not the Immortal Realm, nor the Demon Realm, but the Demon Realm. It is reported that the territory of the Demon Realm is very large, occupying more than 60% of the entire Immortal Demon Realm, and the Demon Realm's emperor-level masters are more than the Immortal Realm and the Demon Realm, which is second only to the Dark Star Realm.
The demon world is divided into three major races: the walking beast family, the flying bird family, and the dragon tribe, of which the leader of the dragon clan is the Dragon Emperor, and the leader of the flying bird clan is the Peng Demon Emperor. The Beast Walking Clan is more complicated, the Bull Demon Emperor is the leader of the clan, but the Great Ape Emperor has the tempering of the Inheritance Forbidden Land, and its combat strength is stronger than that of the Bull Demon Emperor who has the Inheritance Spirit Treasure. Therefore, the Beast Walking Clan is not the only one of the Bull Demon Emperor's family.
In the face of the top combat power of the Demon Realm, the Immortal Realm and the Demon Realm are completely insufficient to see, why do you say so? It was reported that the Dragon Emperor of the Eighth Rank Demon Emperor did not need to inherit the Spirit Treasure, and gently threw a punch to break the Ninth Rank Immortal Emperor Xuan Emperor's artifact suit. It can be seen from this that the Ninth Rank Immortal Emperor was completely insufficient to see before the Eighth Rank Demon Emperor of the Super Divine Beast. Of course, there was a strong person in the Immortal Realm who had gradually reached hundreds of millions of years, and this strong person was the Qing Emperor, because he had obtained the Nine Source Yuanzhu in the Fan Shrine, and with hundreds of millions of years of cultivation, the Qing Emperor of the Eighth Grade Immortal Emperor had already surpassed the Dragon Emperor and the Great Ape Emperor.
Third, Emperor Yu was a younger brother
Although there are many powerful people in the Immortal Demon Realm, the highest exposure rate is that of Emperor Yu, who has average combat strength. Since Qin Yu promised to avenge Emperor Xiangyang, Qin Yu had to kill Emperor Yu. It was only that Emperor Yu was too arrogant and took the initiative to kill Qin Yu completely, which further escalated the contradiction between Qin Yu and Emperor Yu.
In order to snatch the Mitu Divine Scroll and the Ten Thousand Beasts Atlas from Qin Yu's hand, Emperor Yu summoned more than thirty Immortal Emperors to set up the Suoyuan Refining Fire Array. And Qin Yu hid in the Jiang Lan Realm without being affected at all, and cultivated to the level of a first-level Immortal Emperor in the Ten Times Time Acceleration of the Jiang Lan Realm. Until the time when Qin Yu let the Blood Dragon be proud, Emperor Yu still mistakenly believed that Jiang Lanjie was the Qingyu Immortal Mansion.
In the face of the eighth-level Immortal Emperor's mutated super divine beast, Emperor Yu had no strength at all, and could only flee in a hurry. Since then, Qin Yu has become Emperor Yu's inner demon, and is eventually killed by Wu Lan.
Summary: Jiang Lan Realm is a super first-class artifact created by Uncle Lan, the level is comparable to the second-rate Hongmeng Lingbao, and all the resources in the entire Immortal Demon Realm are not as good as a Jiang Lan Realm. What did Emperor Yu, the three brothers of Qin Yu who possessed the Jiang Lan Realm, do to fight with Qin Yu?