Despite his rage boiling over to the extreme, the Dark Demon King was utterly powerless.
In terms of status, the Human Emperor was now on equal footing with him in the Cangtian Realm.
In terms of strength, the Human Emperor was no weaker than him either.
Most crucially of all, this was now the Cosmic Secret Realm.
The Cosmic Secret Realm was the Human Emperor’s domain. Even though he was filled with fury, what could he possibly do?
If they were back in the Cangtian Realm, the Human Emperor wouldn't dare act this presumptuously even if you gave him a hundred times his courage.
"Human Emperor, you are now a demon king of our Cangtian Realm. You are no longer our opponent; you are an ally."
"Besides, you are the only one here with the Immortal Body."
"Therefore, you should assist us with all your might to wipe these people out!"
The Light Demon King and the other two also said in deep voices.
"Wipe them out?"
The Human Emperor swept his gaze over the Madman and the others, a full smile blooming on his face. But the moment his eyes landed on the Four Great Devil Kings, his gaze instantly turned glacial. "If not for the restriction of the Heavenly Dao Rune preventing me from striking at you personally, I would definitely end your lives with my own hands right now!"
"You..."
The Four Great Devil Kings glared at him in fury.
Chapter 590