(General POV)
Location the Warp-Directly Over the Realms of Chaos/On the Azure Moon of Chaos
The three Chaos Gods, the three brothers were next to one another, resting next to a moon rock formation as they poured their daemonic and corrupted powers of Chaos into the blue moon, that their currently on.
While they did this Khorne asked Laharl to elaborate about the special additions he plans to add to this "Neutral Avatar".
As he concentrated his dark powers through the moon, Laharl sighed, not opening his eyes or turning to his brother direction he simple decide to speak.
He told them that this avatar would not be like the Infernal Destroyer in anyway, it's design to act as a void...a suit of armor that can be piloted...better said operated by multiple Chaos Gods, it will be strong in terms of the magical (fantasy) world they invade and corrupt, but the avatar will not be able to fully unleash all their power.
This immediately caught both Khorne and Nurgle's attentions soo much do they stop pouring their powers into the Azure Moon!!!
Of course the Dark One noticed this and said, "Calm yourselves. Their is nothing to worry, this avatar I designed to be ever growing in power and potential, so eventually in the far future it can handle and unleash around 25% of our powers. The main reason I'm designing this avatar like this, is so we don't accidentally destroy the world we visit..." he told them, that while the dimension their going...the Old World, has some demigods roaming around...
It can't handle their full manifestations into that realm, the avatar wouldn't only help us better control their power-output but also act as meaturing tool for their rivals and potential followers.
Any major damage that the avatar would be able to sustain can be fixed and improved upon, including its strengths and abilities.
The Dark One elaborate further that this will make all Deities including counterparts of themselves blind to their presence, until they start causing mayhem and slaughter, all souls, servents, creatures, daemons, relics, artifacts, weapons, arts, knowledge and much more that they collect will be distributed equally on the condition should they find anything that suits/complements one of them will be given to that God, without damage or tampering.
Both Nurgle and Khorne, agree to this condition as they return to corrupting and molding the moon to their benefit.
Laharl continued that he'll install failsafe on the avatar should someone in anyworld defeat it regardless of its current "level" it will open a gateway back to the altar, while also teleporting all their forces to their respected part of their realm, that way they'll suffer no great losese and try again, with more numbers and greater strength, Laharl took inspiration of this "failsafe" from the "what if" scenario from Mark of Chaos, if the Chaos Gods didn't retreat when the 12th Everchosen, Asavar Kul was killed.
Then the next thing he said was something they all agreed deeply, "Beside my brothers. There is one more reason, an important reason I'm making this avatar this way. So we can enjoy ourselves. While it's true what mortal say..."There's no kill, quite like overkill."...I say that's only true for someone I despise. Everything else I want to enjoy their struggling and false hopes that they can challenge me...or us, cause in desperation, even a ant can become a challenging beast, that will be entertaining as well as worthy to crush. Don't you two agree?" Khorne responded, "I indeed agree!!! While I care not where the blood flows brother. It's better when it comes from struggling warrior, then a weak insect."
All the while Nurgle, laughed pleased also agreeing with his older brothers.
The final things he told them that he'll install to the avatar is a "System & Advisor" he explains a system will meature the stats, spells, equipment, army management and much more for them in lists and numbers.
While the Advisor, will work as it sound possessing great knowledge and insight of the worlds they'll traverse but also grant them the best advice in situations, both Khorne and Nurgle commented that would be very helpful, as Aillia was cheering her Lord on, in his head with all that settled he asked them, "Anything else you want to know?" the Dark One, said with a smirk on his face.
But neither the Blood God nor the Rot Lord had any more questions or curiosity about the soon to be created avatar, so for now they focused on finishing their Azure Moon.
After sometime...
The Azure Moon was fully corrupted and transformed to the three Chaos Gods desires...
While it still remained primarily it main azure blue color, the moon has gain a lot of changes and mutations from red spots of crators filled with scarlet blood forming pools, these red spots of blood emenate unbridled and endless fury, hate, and bloodlust the touch of Khorne, on the Azure Moon!!!
All the while yellow green rives of puss, geysers of miasma and countless amount of fungus and mold spread through the moon, and long open sore like maws which fleshy tentacles reach out to space outside the limits of the moon, this is the touch of Nurgle, on the Azure Moon, and lastly...
All over the moon countless sharp, white and black needles of various sizes sprout to the blue ground, violet and burgundy colored vines and trees grew out the moon's surface sprouting needles, black leaves, and maws with razor-sharp teeth all the while these daemonic trees were able to whisper and speak maddening messages to all that manage set foot on Chaos Moon, this is the touch of the Laharl, on the Azure Moon!!!
As the three brothers, enjoy the aftermath of their completed moon, and as the Dark One desired he has insured to make this moon a direct part of the Realm of Chaos, and indestructible using his [Void] divinity to do so. [Special Thanks to, Christian_Poole for this addition to the Azure Moon, happy new years!]
By feeding the Void into the Azure Moon, even blanks can't harm or be immune as they'll be pulled into the endless void, just like own souls are to the Immaterium.
But that was done, its time to finally make the altar that will house securely the avatar, as well as to finally make this avatar.
As Laharl told his brothers, to follow him to the entrance to the Azure Moon's core, and it'll shall be only accessible by the Chaos Gods alone once they are accepted to unite.
Location the Azure Moon of Chaos/The Secret Stairway to the Core Altar
At the part of the blue corrupted moon, which can be called its darkside, was a pure black eight-point star which can't be seen only sensed by the Chaos Gods that have formed a connection with the Azure Moon, directly.
Once they arrived, the three immediately could sense the secret entrance below them as they walked to the eight-point center, and with a simple pulse of power, from the meager level, cause the "mechanisms" in place to activate only recognizing its three masters, Khorne, Laharl, and Nurgle.
That said mechanism, upon activating it started to follow the ring that formed the eight-point star revealing a spiraling staircase that led to the deepest part of the Azure Moon, it's hallowed core since it no longer functioned under normal physics, no longer needing a gravitational ring, or molten core to be stable only the ruinous powers of Chaos to exist forever...
Laharl started descending with both his younger siblings following him down to the core, deep below.
Location the Azure Moon's Core
After a while of descending the trio of Dark Gods, made down to the hallowed blue moon rock core of the Moon.
Empty for now...as Laharl told Aillia to use one of his four remaining Free Absolute Creations to create an even massive altar, similar to the one that housed his Infernal Destroyer, but at the sametime very different as well...
Before they could get adjusted to the empty chamber it was quickly illuminated by a source of very bright light, in the shape of a sphere.
Like so many times before it first came fort from within the Dark One, floated in the air for a moment before it turned back, heading straight towards Laharl's chest, entering him as the FAC read all his desires and thoughs, as a massive flash of light burst out of him fully illuminating the core chamber.
As the once empty chamber was now filled with a giant black and azure colored stone altar in the same style of the Infernal Destroyer's only instead of thirteen steps or columns it was filled with ten giant thrones all circling the edge of the altar.
Each of the throne top head rest was their respected and individual mark, including ones that Khorne and Nurgle weren't familiar until Laharl told them to Khorne's right is Hashut, while his left was Tzeentch.
The throne to Nurgle's left was Ultnarth, and to the right was Slaanesh, while the Dark One's throne was in between Slaanesh and Hashut's.
Before Laharl started on creating the avatar he told Khorne and Nurgle to place their swords at the bottom step's center, and as they proceed down Laharl called out to Khorne, making the Blood God turn to him.
He conjured a black and violet greatsword, commonly wielded by his lesser daemons, the knightmares and tossed it to Khorne who caught it with ease, as Laharl said, "Do me a favor and take that sword and place at the center with your hellblade, and Nurgle's plaguesword." Khorne scoffs as he proceed to do as the Dark One requested.
Once Khorne and Nurgle did as Laharl requested he told them to sit on their respected throne and once he summons fort the Warp Tesseract, to pour their power to it just like they did with the Malafex Temple and the Ochain Shield.
Nodding to the Dark One, the Blood God went to his throne and Nurgle to his, as they channel and gathered their powers, Laharl has already prepared a FAC.
Just like last time Laharl used the FAC in the Malafex Temple it did not immediately rush into him when he used it, instead it floated to the exact center of the altar and in-between the three Chaos Gods, and the moment Khorne and Nurgle saw the sphere of light, shining in front of them they unleashed their powers in a stream, while Laharl only use his [Carnage, Desacration, Devastation, Madness & Void] divinities this time to create this avatar.
The three steams of different Chaos energies struck at the FAC making the orb of light grow and expand in power and size, now it was illuminating the entire, dark core of the AzureMoon, as the FAC not only has all three Gods' powers, and divinities, but also their desires to create this avatar to cross the infinite multiverse and fight, kill, lead, corrupt, and conquer other worlds in the name of Chaos.
In a quick bright flash of white, red, violet, and green that illuminated the whole temple and temporary blinding the brothers as the Free Absolute Creation, as read all their thoughts and desires, resulting in the avatar that they wished to create.
Once the light faded, at the bottom appeared a sphere of energy similar to the one that held the Infernal Destroyer in the Nethervoid which only Laharl knows that detail...within this energy sphere of surging Chaotic energies was the avatar, on it knee, grasping on the handles of daemonic great sword created in the combination of a darkblade, a hellblade, and a plaguesword.
This avatar resembles a heavy armored, Chaos Lord from the Old World, it has a long bull horned helmet with a sharp-teeth jaw bone and nose ridge attached to the front of the helmet and a long black fur coat like cape, with several skulls attached to the cape, this armor is grey when all three Gods are controlling it, but when one is in charge it turns from violet, red or green.
Three of these skulls on the cape, are marked and mutated by the Chaos God in control-Laharl's skull has long curved horns, three eye holes and the mark of Carnage on it as it has a light purple fire glowing inside of it, Khorne's skull is constantly bleeding from the eyes, sharp fangs and teeth, with a brand of the mark of Khorne and the eyes blazing with fire, and lastly Nurgle's skull, is cyclopian with a single horn and oozing vile.
The avatar in certain moments switch form along with its sword that Laharl named the Hellbane, resembling a daemonic black single edge greatsword, with a eight-point star as the handle of the sword, depending who's operating the avatar the greatsword's blade will change to the blade of the swords used to make it, possessing all their strength none of the weaknesses, and when it other forms that Chaos energy and abilities shall be doubled.
At last finished it was time to use and prepare for the world-jump.
Laharl told his brothers to get comfortable in their Thrones of the Damned, as he started to explain how their going to activate the Avatar, he named after a possible mortal Chaos Champion, Ixion Daemonhart.
They'll be personally operating it by transferring their consciousness and essense into it, while their bodies remain sitted on the throne cover in the same protected barrier around their bodies until they return.
Khorne and Nurgle told their brother to begin the process their eager to use their new avatar, and personally lead a battle, shaking his head he responded, "Well get comfortable. Cause it's going to be sometime before we're back on our godly bodies." as they began the activation, temporal consciousness transfer to the avatar, Ixion Daemonhart.
(Avatar Ixion/Chaos Gods POV)
Location the Grand Cloister of Destiny/The Dimensional Gate of the Gods, Resting Place
All Dark Gods: We returned to the altar grounds, after contacting our forces to go through portal we opened back on the Azure Moon Altar of Ixion.
Now we're in the cloister which housed the Dimensional Gate, and no soon that we arrived in this avatar named Ixion Daemonhart, all entire daemonic and mortal army was gathered as each one of us promised.
All of Laharl's shi'lanorai and daemons, plus Khorne and Nurgle's daemons were gathered all roaring, and cheering for the upcoming slaughter and battle their about to wage.
We greeted our forces as we spoke as one through Ixion, "My forces!! Today, we cross the gate onto another world entirely. We shall face many creatures and adversaries, that will provide us with great Carnage/Death/Blood!!! We shall feast on their souls and misery, for we claim that world in our name!!!! Will you all offer me their fear, their anguish, their souls, their skulls, their lives!!!!?" when we finished our speech, all our force rejoice and praised us, "Carnage shall reign. Slaughter shall fall!!!", "BLOOD FOR THE BLOOD GOD!!!! SKULLS FOR THE SKULL THRONE!!!!!", "All shall embrace the Rot and love our the Grandfather!!!"
This greatly pleased us, as we turned to the Dimensional Gate, using our will to activate it causing a surge of energy to pulse at the edge of the ring, as the once multi-colores liquid center became a tunnel which breach the wall between dimensions, as we started walking through it, with our army following us close.
With this we've officially started crossing dimensions, we've achieve a world-jump.
Immediately after the last of our force cross into the tunnel, it closed behind us as we kept on walking through this tunnel of grey and silver, and at it's end the Old World.