To become a Saint!
That was the greatest dream of the Minghe Ancestor, and there was nothing that could compare to achieving sainthood—not even if it meant risking the future of the entire Netherworld Blood Sea lineage.
Next, the events simplified; the Minghe Ancestor joined the Heavenly Court and became the fifth Quasi-Saint, secretly creating a portal that led directly to the Netherworld Blood Sea, home of the Asura Clan.
Ye Xuan made it very clear to the Minghe Ancestor that the Hongmeng Purple Qi was only lent to him and not given; if he failed to become a Saint, then the Hongmeng Purple Qi would have to be returned to Ye Xuan.
The Minghe Ancestor readily agreed, for whether he received it as a loan or a gift didn't matter—whether he could achieve sainthood or not, the Hongmeng Purple Qi would be of no use to him in the future.
Becoming a Saint was desirable, but if he couldn't achieve it, the Hongmeng Purple Qi would be useless to him.