Welcome to my world

Years and years ago the Mundanes And the Downworlders lived in harmony. Supplying one another with goods, foods and other materials that might've been unavailable to them on their original homeland.
As of basic understanding, Mundanes- also referred to as Humans lived in the dry land called Earth, while the Downworlders either lived on the lowest levels of Earth, which were uninhabited by Mundanes, or they choose to reside in the unmeasured bodies of water. Such as oceans or seas. During the time of peace, some moisture loving Downworlders choose rivers or small pools of water, which gave them access to Mundane and Downworlder land alike.

The two species, along with others, such as animals or greenery, all lived and survived by trusting each other and coexisting...
Until the heavens came crashing down.
An all out game of death. No one was safe and food was running out quickly, chances of any species survival were almost nonexistent and that was painfully obvious.

This chaos led to fear. Any alibi was now a foe and alliances were struck down.
War broke loose, soon the Mundanes became a dying species...

But after years of an almost never ending world war, the last mundane king standing, Lord Chasper Chiper, approached God with a deal and a plead.

"Thee asks that this war comes to a halt, that Mundanes are saved and their race continues to live on, that no war ever sets aflame again, and if it does, the ones starting it and winning it shall be superior race, Mundanes. That their needs be not measured and their sins be forgiven, is that all you'd ask of me, Chiper?"

The blonde man stood atop a hill, bowing to a holy shape that seemed to be the size of mountains.
"Yes, that is all, oh holy ruler of the heavens, please have mercy on us..."

The holy body pondered,
"I shall accept your proposal, but even mercy heeds sacrifice..."

"W-what would thy ask of me...?"
The man helplessly inquired.

"I ask nothing but a choice from you, Chiper. A simple choice.."