After hearing Lu Chen's words, the Great Emperors in the hall believed that they too should enter the Outer Domain to compete for opportunities; they did not doubt the authenticity of this information.
The reason is quite simple. There are already many powerful beings outside the domain who do not belong to the Outer Domain, nor do they belong to this universe. Most likely, they come from another universe.
Since those extraterrestrial powerhouses can enter the Outer Domain, it's natural that other universe's treasures can also appear in the Outer Domain.
If there are indeed treasures of the Heavenly Emperor, these treasures absolutely cannot be given to others, even though the record passed down from the Ancient Era, stating "only one Heavenly Emperor can be born in a universe", has never been verified.