I thought that instead of infodumping in the series, I could release some of it as Auxilary chapters instead
Most religions ( at least the human ones ) agree on how the world began, but all of them differ in the ending. This is the beginning of the world by how its perceived in the Church of Aetho ( the biggest human religion in Aroge )
It isn't an exact 1:1 phrasing of how it is in the book but a rough summary of it
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At the beginning there was nothing, endless nothing, the only exception was the god of gods, the most powerful being in the world, his name was Hasowa. But Hasowa one day decided that he was bored of the all nothingness of his world.
He used his power to create. To create a place where he could be by himself yet never feel alone, he first created a flat plane, stretching for infinity. But Hasowa decided that this was too much even for him, he could get lost, and again feel alone. He then shrunk the world down. "Now I can walk over it in only a week, with this I can never get tired of it!" Hasowa said in joyous tone out loud. He continued to wander the finite plane he created for centuries, each time thinking about how great of an idea this was. But with each passing century he grew more tired of the empty plane.
"I know what I will do!" Hasowa said and immediately started planning everything. "I will fill this world with different colours for me to enjoy". And so he did, he added many colours that made the world interesting again, each new sight of the, now colourful, plane looked entirely different. Hasowa was overjoyed by this. And so he wandered again. But even this grew tiresome after centuries. Hasowa was starting to doubt himself. "What if I'm doing it wrong? I can only create a momentary pleasure for myself, before it soon fades away".
But then an idea struck him. An idea bigger than any other, it was the pinnacle of something even someone as great as Hasowa could make. The perfect entertainment for him and him alone. He will create another being to entertain him. And since he learned from his past mistakes, he will make more of them. "10! That's the number! I will create 10 beings that will entertain me forever. I will make all of them different so no two are the same". Hasowa was planning and planning for centuries, possibly longer than he enjoyed the world itself before. When he finally finished he sat in the middle of the whole world and started creating them. "Gods I will call them!" Hasowa decided "A name worthy of creations of mine".
When he finished creating the gods, he looked at them one by one. Each one of the looked different. All looked back at him. Hasowa then said "children of mine, you are creations made for my entertainment, be honoured for it". Hasowa as the creator of everything thought that that was at least deserved for everything he has done so far. But since the gods were created with him in mind. They were far too arrogant like Hasowa himself. They glanced at each other in disbelief someone would have the indecency of talking to them like that. With their exchanged glances they quickly decided that Hasowa should fall, as the only threat to their existence. They all charged at him. Even though Hasowa was the being of creation he couldn't stop them. They slowly overwhelmed him and defeated him. Victorious they decided to explore the world they have been created in. They wandered for centuries just like their creator did, each time shaping the world in their own way, one of them added mountains since they could now see more of the world. One created lakes for everyone to enjoy the sight off. One created caves, so that the world could be so deep even the under ground could be explored. Others created deserts, forests, and plains, planting grass and flowers everywhere they could. But one felt like the world was big enough, he convinced all others to fill the surrounding land with water, water that no being could pass. They filled it with salt to poison it and created huge storms above it so no one could sail away. "The world was finished!" They thought, but it lacked something. "Magic! That is what we are missing!" One of them exclaimed. "The world is now full but it doesn't move. We should create magic to move it for us!" She said. But others disagreed. "We should make other beings, beings that would move the world for us."
After some time both sides went different paths. The one that wanted magic in the world made sure it was seeping out of the world everywhere. But they did leave out few places, after all these places didn't need magic. They didn't deserve it.
Others who wanted life in the world, slowly started shaping it. Everyone created different kinds of life. Some were standing on two feet, some on four. Some of them didn't even have any and ended up in the lakes underwater.
But at last. They created the final being. The one who would rule the world.
"Humans. The new rulers of the world. They will be everywhere. Big and small, above and below the ground."
After they were finished with the world they have made, they all retired high in the sky and watched as the world below them slowly changed.
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That is how the Aetho religion thinks the world began
The end changes a bit in other religions but basically all of them start with Hasowa creating the world and gods creating the perfect being ( in this case it's a human )