Creation story (Xenos and Concordia Setting)
In the beginning, there was Eos and Ios. They created two sets of twins: Fire & Water, and Earth & Air. When they were born, they create a circle of reality in the nothingness: The Elemental Planes. Then, each of the sets of twins had a child: F&W had Feywild, and E&A had Shadowfell. When these two beings were born, inside the circle two realms where created: the Realm of the Fey and the Realm of Shadows. Then, Feywild and Shadwofell had a child: Etheral. When he was born, a mist settled over the planes, creating the Etheral Plane. Eos and Ios had two more children: Io and Eldritch. Io claimed the air of nothingness inside the circle, while Eldritch claimed the area of nothingness outside the circle. Io then worked to create Tiamat and Bahumat as his children, while Eldritch was creating a realm of his own. When the Elemental Gods came to see what he had created, they were horrified. The realm was a cluster of ooze and buildings, and the inhabitants transportation was flying shells. His inhabitants were Aboleths, Beholders and Mind Flayers. He declared his followers to be aberrations, and they shall create life on the other planes. His siblings thought if they created space between them and Eldritch's realm, they could save their realms from corruption. So, they begged their parents to seperate them and Eldritch, saying all sorts of things about him. So they put their hands between Eldritch's realm and the Elemental Planes, and split them apart, putting themselves in between the two. Ios became positive energy, while Eos became negative energy. Eldritch swore that the children of Etheral shall avenge him, and that his children shall enslave all beings of the Inner planes. The aboleths who were in the Water plane, heard his cry, and set off to the Martial Plane. To prevent this prophecy, Shadowfell killed the physical form of Etheral, and tried to slay his consience until Feywild intevened, saying that without a body, Etheral cannot create life. So, satisfied the prophecy was prevented, he went to create life in his plane. Feywild hated shadowfell after that, and to spite her husband, she taught Etheral how to use his mist to create life. Then she went to create life on her plane.
Etheral formed his mist into 3 beings: Rex, King of the Xenoian Gods, Heros, King of the Concordian Gods, and Pyphia, queen of the Unaligned Gods. He told them to visit earth for materials, Fire to forge them, Air to instruct them how to use them, and water for wisdom. He used his mist to disguise them as children of Io. So, they went to the earth, and asked for materials. He gave Rex Iron, Heros Bronze, and Pythia Imperial Gold. Then, the asked fire to forge them something out of the materials. He gave Rex a Sword. Heros a Spear, and Pythia a Scythe. Then Air trained them for 2 years, and Water taught them for 1. At last, they were ready. But they had no army, while the Elemental Gods Had elementals and genies, and shadow fell had his ghost. Their father told them to ask Io and Feywild for help. Io said he will give them the dragonborn, but not any dragons who served under Bahumat or Tiamat. Feywild gave them her Fey, but the needed more. Fiannly, they saw 3 more dragons who did not serve Bahumat or Tiamat: Moonstone, Deep, and Faerie. They joined them. Then, they waged war on the Elemental Gods and Shadowfell.
In the end, all of the Planar gods' physical form was destroyed. The gods took the elves, dragonborn, and dragons back to the Material Plane, where they waged war on the dragons. In the end of that, Bahumat followed them and tiamat was sent to prison. They created all the races, and divided the world. Bahumat worked with Pythia to create the Old World.