The black sun, which illuminated the vast wasteland of the once with life filled kingdom called Etala, shined bright as Azathoth announced his victory. His speech echoed through the entire realm and could be heard on the entire planet as the in-blood bathing Daemons hailed their dark lord, devouring their prey while waiting for the next realm to conquer.
Azathoth who looked down to his people smiled bright as he turned around to his most loyal Daemon, "Pesty do you know why I wanted to conquer this realm as fast as possible?", He asked in an almost arrogant tone.
"No, my Lord."
"It's simple, time was running out. The World-Tree is a very complicated construct which indeed is very capable in holding itself together, no matter what happens to it. Even the power of the Void at its former peak wouldn't stand a chance to its light and would only be banished back again.
But have you ever wondered what happens to the World-Tree's branches when they fall off?"
"I haven't my Lord, after all that only happens once a century. But wouldn't they simply cease to be?"
"That would be the normal thought, but in fact they don't. The branches continue to exist at the very bottom of the World-Tree, an infinite empty space which is even bigger than the current tree itself.
But why do you think such a place exists in the first place?"
"Maybe... To stop the Void from expanding itself and force it to remain as divider?"
"Bullseye! The World-Tree knows that the Void is currently decreasing in size and therefore holds it between itself until the Void completely succumbs to its light, becoming nothing but a mere shadow of the tree. Such a bad thing would erase a huge amount of my power and existence since the Void and I are one and the same.
And so, I was thinking of a way to escape this fate of mine and found one.
I will purposely make this realm fall and then used its dying energy to rip a hole through Existence itself which allows me to forcefully stuff and expand the Void inside the space below, manifesting one part of the Void as the Darkness it originally was, forcing Existence to accept it as own place and redesign itself with the Void as counterpart to Existence."
"Amazing! And when will you start with this plan?", the Daemon asked amazed by his Lord's plan.
"I'm already doing it.", Followed by Azathoth's words a giant black cloud, darker than black itself, covered the entire realm and ripped it out from the very World-tree itself. Once finished, the cloud started to stretch itself around the tree, embracing it in a cold long hug until it arrived at the bottom of Existence.
Arrived at the tree's very feet the cloud exploded and grew massively as it expanded into all directions corrupting the empty graveyard until only an infinite darkness replaced it, dwelling in delight as it conquered the space that originally was its own.
Once that happened Azathoth and Pestilence opened their eyes again seeing that the black sun had vanished from the sky, replaced by a giant golden tree towering over the infinite Void as it illuminated it with its golden light.
Pestilence smiled as he witnessed his lord's power but suddenly froze as he saw the wrath in his Lord's eyes.
"My lord what's--"
"So, that's what you came up with huh?"
"W-What do you mean my Lord?"
"The moment I expanded the Void down here and manifested it as counterpart to the Golden-Light that embodied Existence, the World-Tree was about to collapse as it had no divider anymore and so, it created a new one. A vast shadow of itself which devoured the space I left behind in an instant and replaced me. A cheap copy of me which was born as slave to the light, just a mere absence of light with no meaning despite being the darker aspect of the light that birthed it. A false Darkness."
"But is that even possible!?"
"As you heard, it is. But...", A sudden smile suddenly grew on Azathoth's face as he looked at Pestilence, "...This way it's way more fun don't you think~"
Pertinence heart skipped a beat as he heard these words, smiling in joy as he knew that a bloody and amusing future awaited them.
But as both enjoyed themselves with another victory over creation itself, a new entity watched them. A being born out of the bottomless Abyss that gathered itself inside the light once the Void vanished.
The Shadow-entity stared envious at the new plane of Existence, knowing it was simply a cheap copy of the true Darkness which now lurks below the creation. It knew it was nothing but a simple shadow which now lived inside the World-tree, working as it's guardian against the true darkness by filling the once empty space between worlds with infinite shadows and form a barrier around the world tree's roots, stopping the Void from expanding towards the tree itself by simply existing between Light and Darkness, knowing it will stay bottomless as long as the light stay infinite.
***
After a couple months have passed Existence was completely redesigned and divided into three planes which perfected the once known world into an even higher state of being.
The World-Tree was the first plane to complete its evolution and became the most important plane, following that title as the towering golden light of creation in the middle of Existence while conquering the infinite sky of said Existence with its golden crown that beamed with the live of thousand worlds.
Second and following the mother that birthed it was the Shadow-realm, also called "The Abyss of the Dead", which manifested itself as a black sea in-between creation that filled the once empty places between worlds with bottomless shadows, tainting the sky of the World Outside in an infinite night illuminated by only golden light.
Third and last to manifest was the "World Outside" known as the Void, and the true Darkness that dwelled below Existence, embodying the darkness that comes from the outside. It was as beautiful as it was terrifying, a place of only war and chaos formed of only magic as it denied itself any physical form, thus giving itself infinite forms created of the infinite dreams and nightmares that faded to Non-Existence once the people awoke from them.
Nearly after all Planes of Existence manifested themselves creation declared war against the world outside, denying its existence by correcting it itself.
But as the supreme gods that ruled creation prepared themselves for the new war against the Daemon Sultan, ready to annihilate the dark world that formed itself below them, they failed to notice that unlike them the Daemon Sultan already was in war with them since the day of his birth and already one step ahead of them.
"My lord, I'm here to tell you that "It" was indeed capable of tearing itself inside the Abyss and manifest itself as a permanent portal inside the bottomless pit.", A familiar grotesque daemon known as Pestilence reported to his supreme creator Azathoth as he kneeled before his Lord's eldritch throne which bubbled in the center of all infinity, seemingly alive as it whispered seducing knowledge inside the rotting ears of his.
"Good. But don't get lightheaded... The Abyss is still a place no one has been able to explore yet. It may be a perfect solution for the travel problem of both planes and only a tool for both of us but it's still a plane of its own. We have no information what awaits us at the other side, how to maneuverer through the Abyss or how to gain control of it. We may be the first who have found a way inside but that doesn't mean we will be the first to master travelling inside.", The Sultan 'briefly' explained as he looked down on his daemon prince.
"Y-Yes... I'm sorry... We will of course make more than enough preparations to annihilate anything that awaits us at the other side...", The prince quickly responded as he tightly grabbed the ground below him, regretting the carelessness he showed a couple second ago.
But before the prince could continue any further the Sultan smiled as he before he appeared in front the prince, "Nonetheless, you still accomplished a great achievement. So, tell me, is there anything you wish to have? If I'm able to fulfil it, I will grant your wish.", The Sultan said, showing off the murderous beauty of his existence to force the prince to state his deepest darkest desire, an ability the Sultan performed without knowing it himself.
Faced with such a murderous beauty, the prince backed down and gulped as he finally stated his wish to save himself, "I... I wish to have my own domain..."
"Your own domain?", The Sultan asked to verify what he just heard.
"Y-Yes... A place within this realm in which a part of my soul resides would not only strengthen my bound to the dark world but also strengthen the bond between me and my followers and enhance their power multiple times over as long as their connected to this realm..."
"I see...", The Sultan said as he acquired new knowledge, repaying said knowledge and efforts with said domain the prince asked for, "Then you can have the southern region and claim the two realms of this region as your own."
"Thank you, my lord. Your kindness is truly bottomless."
"Yeah, yeah. Just go and do your work, after all as prince you enjoy the freedom of acting on your own."
"As you wish!", Once these words left his mouth a toxin green slime embraced the prince, dragging the embodiment of pestilence deeper inside until he completely vanished.
"Pesty sure is strong... But he alone stands no chance against creation... In our position quality will not beat quantity, no matter how strong I am... Sigh... Which means I have to make more...."