Primal Infernal Dragon Versus Void Ruler, Heavenly Void Spirit World Collapse

The Primal Infernal Dragon was dead? 

Yes. According to the Void Ruler, he died many eons ago. 

The Primal Infernal Dragon who appeared from the river of time was him in the past, the one that was alive.

"Impossible. Even if it's you, there's no way you can cross the river of time and travel to the present from the past! How did you do it? Wait… I know. I understand now! It's the formation!"

A sudden realization struck the Void Ruler. As he looked at the countless runes and restriction seals across the valley, he finally knew what was happening.

"This formation. This formation did not only seal me, but it also contains the power of time and acts as a coordinate, a medium for you to pinpoint the exact time to appear! That's why you can time travel! But the core of the formation…"