Living near the Azure Roc Sect, Dongbo Xueying was shielded by the treasure bestowed by Ancestor Tianyu, making it difficult even for the Black Emperor to spy on him. Yet through the Crimson Nightmare Inheritance, the Black Emperor could still pinpoint Dongbo Xueying's location and judge his attainments in the Crimson Nightmare Inheritance.
"Although the lineage of the Realm Ancestor is generally weak in combat power, it has the advantage of being very easy to cultivate," the Black Emperor mused. "My lineage is immensely powerful, but cultivation is extraordinarily, extraordinarily difficult."
He and the Realm Ancestor were brothers who would live and die for one another, growing step by step from weakness.
Even when they were in the Chaos Realm, they had still competed against each other.
But later...