The exact creation of the world is unknown, there are many beliefs and religions across all 4 realms, 

but as far back as can be remembered is called V'olarvarld. This translates into  "Oldest world timed" in ancient V'olarvarldi.

 when the 4 Realms lived as one large world...

In this time, there lived 2 categories of humanoids; 

Orinaran, beings who exist in the world without any sort of physical connection to it, and Enchantans, who are born connected to V'olarvarld.

The orinaran lived peacefully alongside the enchantans, under the guidance of the creation beings known as Chayot. They'd support each other, trade wisdom and magics, potions, medicines, gear, and anything else for that matter, and despite the occasional jealousy from orinaran and egos from enchantans, the world still went round and the Chayot managed to keep the peace.

Everything was good.

There were 20 Chayot, and though the Angelic Hierarchy was not yet established, angels still did worship and serve the Chayot as they continue do in current times. The Chayot we're the protectors of all people both with and without magic, taking turns to serve the people and taking shifts to support the 6 pillars of reality.

But after decades of feeling unspecial, there were orinaran that got greedy and craved control of the enchantans, deaming their magics a threat. It started with longer work hours, grew into assualting random enchantans, and lit a spark in the uper-classed enchantans superiority complex.

The Chayot tried their best to keep their people, enchantan and orinaran, together. Attempting to mend the gaps, attempting to educate on the dangers of envy and pride... But everytime they blinked, it seemed the tear between them has gotten bigger.

And within a few years, their people have torn into countries with steel boarders.

But despite the growing tension, it was, for the most part, peaceful....

For awhile.

Some orinaran have began to study enchantans, and the magic of the animals and plants, coming together to form an alliance, they called the "Blood Hunters." Their goal? Becoming man-made enchantans. 

And what started as animal testing, grew into missing people. Men, women and children who'd stray too close, it didn't matter to the Blood Hunters, as long as they were an enchantan. Noticing the increase in missing persons, the surrounding enchantan communities grew suspicious of all orinarans, despite the chayots protest. A group of soldiers run their own experiment to figure out what was going on, where their people were going and they stumble upon the Blood Hunters in the act.

 A match in a gas tank.

This discovery outraged enchantans everywhere, leading to 3 territories of enchantans to come together in an attack on the Blood Hunters, where the orinaran chose to defend the Blood Hunters and retaliate.

One by one, countries, territories and kingdoms from both ends joined, and many innocent towns were devastated just for being enchantan/orinaran until there was no one left on the map that wasn't involved.

V'olarvarld became a warzone, the Chayot couldn't break up.

The enchantan might faced the orinaran's knowledge, their cleverness, their weaponary and their tactics, often leading armies out of their elements (literally) to pick them off by pockets. But as the enchantans picked up on their tactics, they began to mix their forces and avoid their tricks, and the orinarans lost their advantage.

The enchantans began to dominate, annihilating the Blood Hunters completely, and those whom enabled them joined the mass grave. 

But the enchantans didn't stop there, they began to attack all orinarans, and enchantans began to divide amongst themselves.

Everyone began to fight everyone else, until no one could trust anyone whatsoever, some going as far as to attack the chayot, their protectors, for attempting to intervine.

With no end in sight, the Chayot grew desperate. they began to discuss any possible way to end the feud, before it wipes out both enchantans and orinarans.

After many debates, many disagreements, many suggestions, they could think of no other way.

The majority agreed they must separate their people before there's nothing left to protect, and they agreed boarders weren't enough.

So they chose to sacrifice themselves.

14 Chayot gave their lives in a ritual, accompanied by hundreds of their angelic followers, the ritual ripped V'olarvarld to pieces and their bodies forming new worlds into the 4-Realms we know today.

This event is referred to in modern day as "The Big Split."

Aethoria

Comes from the ancient V'olarvarld language; "Aetho" meaning angel and "Thoria" meaning palace/kingdom of.

Aethoria was created to be the "kingdom of angels." A place for the Chayot and their angelic followers to reside and maintain the Chayot's duties.

Kerithea

The origins of the name is unknown exactly, but it's suspected to have come from the ancient V'olarvarldi word, kerial, meaning sea and the old common word althea meaning shurbs.

No matter where it came from, it is quite similar to the human-realm, Earth. It is the land for everyone whom isn't in service of the Chayot.

Noxaroth

Also from ancient V'olarvarld language; "Nox" meaning land and "Rothe" translating to punishes. "Land punishes."

Living up to it's roots, Noxaroth was created to be a "land of punishment." A place for those who disturb the peace to be sent. Angels were sent, tasked with upholding the order and "dealing with Aethoria's foes" but the far different climate from Aethoria caused them to evolve into the demons we know now.

The 6 remaining Chayot were left to hold the pillars of reality, entrusting their duties of protection to their Angelic followers.

The Angels understood that if the humans had knowledge of the other realms, then it would cause them to destroy themselves through greed and curiosity, so they had to wiped as much evidence and contact from their realm to the others, the strongest of their mages came together to cast a spell on the human realm, Earth, to prevent travel to/from the other realms, without components from Aethoria.

But, despite the entire new world, the orinaran and enchantans continued to fight amongst themselves for 3 months until they seperated, forming countries, communities and new territories.

After the realms were named, the orinarans and enchantans picked up new terms;

Earthlings and Keritheans became widely used, burying orinarans and enchantans termonology for good.

The angels during this time began to form their hierarchy, trapping a neutron star in a magical dyson-sphere like concoction and using its energy to create their ranking system. Their higher rankings formed their mainland by utilizing the gravity of the star.

Occasionally the Angels would visit Kerithea and Noxaroth for resources and to carry on the Chayot's duties of peacefully resolving disputes.

Things FINALLY began to calm down in all of the realms, and Aethoria opened its doors to Keritheans interested in serving the Chayot alongside the angels, commemorating the Chayots' sacrifices for peace. The Keritheans that joined Aethoria fit like a puzzle piece into Aethorian life, and they earned their ranks just like everyone else has.

But if the realms learnt anything from the past 500 years, it's that peace doesn't seem to last very long...

The Chayot grew exhausted. But hatred and greed got to one of these Chayot particularly, one of only two who protested the sacrifice to create the realms. This Chayot is known as Draknov. 

Draknov betrayed the other Chayot, abandoning his pillar and tearing into Kerithea, blaming the Keritheans and Earthlings for the deaths of the 14 Chayot. 

Draknov proceeded to devastate over 30 Kerithean civilization, before tearing into the protective spell to Earth, where he was eventually stopped by the combined forces of Aethoria, Kerithea and Noxaroth. The trail of devastation left from Draknov is still recognized in modern day, and Draknov was trapped in a spirit trap crafted by most powerful mages in the realms. The current whereabouts of the trap remain unknown.

Meanwhile, the last 5 Chayot are left sharing the burden of the 6th pillar, and a crack begins forming between Kerithea and Aethoria as Kerithea attempts to pick up the pieces left behind.

Aethoria began to grow uneasy at the betrayal, and the distance Kerithea pushed Aethoria to the edge. 

Aethoria sent representatives to Kerithea and Noxaroth, carrying a demand for their complete obedience. Noxaroth offered to negotiate on it. Kerithea declined on the spot and pushed back; Arguing that their realm was created for freedom from the hands of war and the control that war held over them historically, not for the Angels to dictate their freedom. 

Aethoria didn't take Kerithea's push well, and diplomatic rivalry began to brew and sour. After years of back and fourths, Aethoria's drive for lawfulness grew relentless, and in a last ditch effort for control, soldiers were sent to the 5 most populated towns in Kerithea. They threatened the residents, and when reinforcements arrived, they lit the towns ablaze. They slayed hundreds, leaving the towns in rubble until the leaders submitted to their rulings.

Noxaroth witnessed this, repulsed by Aethoria's drive for lawfulness and control turning cruel, they swore to never become them. They abandoned rankings, and rebelled against Aethoria, calling off negotiations and waging war by slaughtering the erelim representatives, displaying their bloodied gear as a statement upon the gates of V'lk.

And Aethoria plummeted over the edge.