The Four Great Beast Clans are the oldest existing clans on the Demon Beast Continent today.
Generation after generation, when a clan member dies, their soul enters the Ancestral Mountain of the Four Great Beast Clans.
These are the ancestral spirits.
Of course, there are requirements for an ancestral spirit to enter the Ancestral Mountain. The bloodline must be pure, and their cultivation must have at least reached the Early Stage of the Boundary God Realm.
Upon entering the Ancestral Mountain, the mountain can preserve their souls from destruction... Of course, if they leave the mountain without permission, they lose its protection and their soul perishes...
The ones who guard the Ancestral Mountain are the Tomb Guardians.
No one knows the true identity of the Tomb Guardians.
All that's known is that ever since the Ancestral Mountains of the Four Great Beast Clans have existed, the Tomb Guardians have been there, guarding them for countless generations.
