Yi Yun ultimately did not belong to Chaos Heaven. What happened to the human race and the Demon Race in Chaos Heaven later on was not something Yi Yun needed to concern himself with.
The Heavenly Dao revolved through its cycles. The rise and fall of every race had to be fought for by that race itself.
So swearing by his Dao heart that he would not harm the interests of the Demon Race was nothing extraordinary.
In Yi Yun's view, the most difficult tribulation to cross was the Ancestral God's tribulation.
He did not know when the Ancestral God would recover, and he did not have much time left to improve himself. He had to seize this opportunity to experience the Demon Altar's heavenly tribulation.
Allowing a human to enter the Demon Altar naturally went against the rules.
But... the temptation of becoming the Demon Ancestor was simply too great.
The Ruins Emperor was already quite old. If he could not accomplish it now, there would be even less hope in the future.
The two old ancestors had already planned to make him abdicate. Once the Crown Prince became a Godly King, he would have to give up his throne.
The Demon Race was different from mortal kingdoms. When a mortal emperor abdicated, he could still become some kind of retired emperor.
But a Demon Race emperor could only step down in disgrace, with the title of former Ruins Emperor.
That was the ending awaiting him.
Having grown accustomed to glory, one could never easily endure the curtain falling. The Ruins Emperor still wanted to struggle a little, and in the Myriad Manifestations Asura Pill, he had seen a glimmer of hope.
"Fine. If you can swear by your Dao heart, I can let you enter the Demon Altar."