As long as it involved an entire race in the Primordial World, it would definitely involve the three trivial matters of destiny, negative karma, and merit.
The ancient battle between the phoenix race and the dragon race should be the first tribulation after the opening of the sky.
At that time, the world had just been established. Connate lifeforms occupied the mainstream. The dragons and phoenixes were the overlords of the two races. Basically, no one had the concept of lifespan. Many living beings who did not have any potential would slowly live forever.
There were truly many Zenith Heavens and Golden Immortals.
However, 90% of those powerful living beings had died in the battle between the dragons and phoenixes. The Primordial World had also been shattered. The structure of the five continents and the trichiliocosm had been formed since then.