(General POV)
Location the Warp-The Neutral Zone of Chaos, the Base of Mount Olympus-Battlefield: Allied Chaos Forces Vs Tzeentch Forces
Floating in front of them their newly ascended brother, the Weaver of Destiny, the Lord of Lies, the Sorceror God, Tzeentch.
Despite being still a youngling in comparison to them, Tzeentch has gain a massive boost in power and magical capabilities than none of them expected, the foreign introduction to none psyker energies has forcibly evolved, the Designer of Evolution, into a higher tier eldritch entity.
Meaning that the Trio, could no longer toy with Tzeentch, they gave to fight him seriously and together if their to win.
The Changer, floating in mid-air started to giggle which turn into a chuckle, and finally turned into a full blown, mad laughter.
Which annoyed the Plague God, fully...immediately, Nurgle swung his seven chain flail, the Phthisis, at Tzeentch who in a moment materialize a magical shield blocking the Plague God's flail, unfortunately it seems that by coming into contact with a new source of magic, Tzeentch's own mana manipulation has drastically increased, which meant it took less time for him to channel and cast spells at them!!
But regardless it was no longer a one on one, so that meant that they can wail on the Sorceror God, without any issues.
Khorne struck from the side, slashing his Unmaker onto the waistline of Tzeentch, which caused a margin of pain and small amount of blood to gush out before the hellfire coating the daemonic, bastard sword, cartorized the cut that Khorne made.
This allowed Nurgle to strike, at Tzeentch that backhanded the Blood God away, swinging down his plague-riddled cleaver, the Worldblighter, at Tzeentch.
But Tzeentch block the toxic blade, with his eighteen claws cross over himself, causing a loud clanking sound from the clash between the Change and Plague Gods, then the Dark One moved in.
Sending two pairs of his serpents, two from upper and lower serpents, overflowing with neon purple, black, grey, colored energy erupting from the mouths of the four serpents, as the Dark Harbinger used his [Warp-Ray] on Tzeench, hitting him at the left cheek, shoulder, ribs and thigh areas of the eldritch entity.
This caused some damage, but Tzeentch quickly send one of his Doc Oct, tentacles to stab into the side of the mountain, and like a mosquito drink more magic from Olympus, mana-veins, which heal all the wounds that he has just suffered but a moment ago.
Seeing this made things clear for the trio, that fighting the Changer this close to Olympus, he'd only restore himself, so both Rot Lord and Blood God acted against the Architech.
Nurgle started by launching his tentacles at Tzeentch, which the Changer responded by sending out his own tentacles against the Decaying God, which made the Grandfather smile as Tzeentch did exactly, as he wanted.
Now some of his limbs, were occupied against him, Nurgle was able to attack without any sort of obstruction and he struck with his Phthisis his seven, spiked skull-head flails striking and piercing into Tzeentch's flesh.
Nurgle's sicknesses in the Phthisis, "Leper's Embrace", the second plague, "Black Blood Boils" and the newest third deadly sickness that he made during the short time in the Greek Realm, using his pet/elder daemon, Skorpius venom as the main ingredient for this plague, called "Chilling Grangenious Requim" that was already suffering the symptoms of all three poxes.
The rot of the leper virus spreading, along with BBB pox causing dead cells and blood to cavulated and infect the Changer in black boils, and lastly frost crystal were starting to rip out the flesh of Tzeentch, not only killing the area with extreme frostbite but also the effects of poisoning, making Tzeentch's joints stiffen from the affects of Nurgle's poxes.
Knowing the danger that he was facing, and struggling against the flames Tzeentch powered through it, and used his tentacles to tear off the infected areas and burn what was left...this cost him, some flesh on his belly, and one right arm.
This brightened Nurgle's mood, seeing Tzeentch suffering as he struck again only for Tzeentch to grab the handle and wrist of the Plague God's cleaver, and also restraining Nurgle's flail by the chains not wanting to experience the Plague God's worst poxes again, as the wrestled against each other's strength.
At that moment the Dark One, struck again at their opponent, his massive gauntlet power-claw thirsty for the blood of Tzeentch, as the Dark One thrusted his claws at the Changer stomach area, but Tzeentch sensing the danger used his telekinetic power to hold back, Laharl's attack.
A deathlock was made between the three of them, but that left him open for the Blood God to strike.
Khorne grabbed onto a couple of Tzeentch's tentacles, and using his Godly strength pulled the Changer away their brothers, and lifted Tzeentch over his shoulder.
This sudden move, made Tzeentch release Laharl and Nurgle, as he used his psychic power to form a cushion for the incoming blow that Khorne was about to do to him.
Tzeentch slammed straight at the side of Olympus, but with his enhanced powers, he lessen the damage that the blow was originally suppose to cause him, plus this close to Olympus allowed him to stab his tentacles into the mountain, and in turn into the veins, quickly draining the magic and restoring himself back to full health.
Even the limbs and chunks that were missing from him, were fully recovered.
This angered both Khorne and Nurgle, while Laharl just tiredly sighed in response, this reminded him of soo many cheap bosses that healed themselves, from the games of his past life...
Tzeentch launched himself from the mountainside and straight at his enemies.
His restored lanky, long arms, now bursting in warp-lightning and tzeenchian flames ready to fight back against all of them.
Tzeentch shot a blast of warp-lightning at Khorne that he had to use his Angra Stone, forming his hellfire shield to block, a torrent of Blue Fire at Nurgle, forcing the Decaying God back, and finally a barrage of Pink Fireballs at Laharl that had to use his wings as a makeshift shield, with the Magni'manta power surging through him, causing the effect and damage of Tzeentch's fireballs to greatly lessen.
Then Tzeentch straightened his larger nine-clawed arms, to dive/stab at them while they couldn't run or counter him, while Tzeentch believe he was above physical combat...it didn't meant, he didn't enjoy the suffering and painful end to his victims in his grasp...using his serpents, to see through their eyes, the Dark One, saw what the Changer was planing and began to counter it.
Using his serpents, four in total from the gaps of his wings, and blasted Tzeentch once again with his [Warp-Ray] skill/attack, at full power, hitting the Changer with blackish violet, neon purple and white edged rays of pure warp-energy, that blew Tzeentch's clawed arms, along with chunks of his head and tentacles.
The attack was strong enough to blast the Changer, to the ground, as he grunted and hissed in pain.
Meanwhile, all three of the older Chaos Gods, were free from Tzeentch's latest onslaught and lower their respected defenses, and prepare for the next boute between them and the now standing again, Sorceror God.
But Tzeentch was wobbling, since he lost part of his "primary" brain, (stands to logic, that Tzeentch would have ever changing amount of brains) making the Changer, change to his secondary brain within his chest with daemon face to straightened himself, as the face appeared to "awaken" with it three eldritch blue/aqua eyes looking straight at the trio, with also his right shoulder, eyeball also watching them intensely.
That daemon face, started to speak to them, "Hehehe...hahahha!!! INCREDIBLE!!!! This power, this magic is amazing!!! And only fitting, for me to use as I see fit...like ending you all!!!!" the Changer's chest mouth, open wide firing a huge ball of daemonic energy, of a dark blue color.
Seeing the incoming attack, Khorne leaped in front of his two brothers, once again activating his Angra Stone and using all the absorb magical energy from before to form a massive hellfire shield, to protect all three of them.
As Tzeentch's surprise projectile attack, crashed/exploded upon Khorne's shield, obstructing all view, the Sorceror God rushed to Olympus again and started to drain the mana-veins of the mountain again, and in turn once again heal himself back to full-health.
But that's when Laharl send a quick message to his brothers on how to stop, Tzeentch annoying healing cycle and finally start to gain grown in this basically siege battle.
Both Khorne and Nurgle, hears Laharl plan and agree fully with it, as they all prepare to execute said plan.
Tzeentch once again, restored he switched back to his primary brain, and in turn made his chest face, revert back to a stand-by/snooze state.
Looking back he saw that...only Nurgle, was standing there without Khorne or Laharl, this alerted the Changer, as he looked around desperately for any signs of his other enemies, when Nurgle storm forward getting Tzeentch's full-attention.
Tzeentch was about to strike at Nurgle with magic, when he was wrapped in a astral maroon colored chain, it felt very powerful and...it restricted his magical connection, looking up he saw the Dark One with his right claw holding said chain.
Thus allowing Nurgle to start beating Tzeentch with his bare bone-clawed fists, causing grunts to come out of Tzeentch, while this happened a rift opened allowing Khorne through to join the beatdown on Tzeench, in order to fully subdue him for the next part of the plan.
Once Tzeentch was basically at the mercy of the trio, Laharl release the hold of his Gleipnir on the Changer, and both Blood and Plague Gods continue to hit Tzeentch, the Dark One open another rift that leads to a far courner of the area, far away from Olympus aka Tzeentch's healing station.
With Khorne, Nurgle, and Laharl's combined efforts they've manage to finally get the Changer far away, from Mount Olympus, at the outer edge of the battlefield, by tossing him through the open rift as Tzeentch rolled across the ground, still feeling the effects of the beatdown, he just suffered.
The plan succeeded thanks to Laharl's chain the Gleipnir providing the restrains, Nurgle and Khorne's combine strength to beat and toss Tzeentch across the rift that Laharl prepared for him, which later they used to reach this new battle-spot between them all.
With that the statement of Tzeentch's constant healing and restoring was over, and they can finally start to cause to mayor and lasting damage to the Sorceror God.
Tzeentch grunted from the combine blast, of Darkness and Hellfire he suffered from the Blood and Carnage Gods, despite having healed much of the previous damage from earlier, he was still hurt as he quickly formed a dome shaped, psychic barrier over himself to protect from the incoming attacks of his brothers.
After a long time, the battle between the four brothers was taking a brutal turn, as they forsaken defense and went full on attack, onto each other.
With Tzeentch using tentacle-lashs, bites, and even spell blasts along with punches and claw swipes on his older brothers, while the trio cut, slashed, punched, strike, burn, infected and soo much more against the Sorceror God.
But at the end,Tzeentch was getting tire of this fight so he decided to end them in one final attack.
He rised his six-lower arms above his head and started channeling to form basically a Tzeentch style Death Ball.
He was almost about ready to destroy them with a massive ball of raw power of Change, keeping the ball of eldritch death over his head using six long arms, leaving his clawed ones free to fight and prevent them from stopping him.
Seeing this, and sensing the danger that, that death-ball possess, all three counter that by aiming at the death ball over Tzeentch's body.
Nurgle struck first using his tentacles to spew streams of gastric acid at the death ball, which Khorne followed up, by unleashed a massive stream of hellfire from his left hand, and Laharl shot a ray of darkness from his right claws and all his serpents' mouths.
With all three combined attacks, Tzeentch didn't expect that move, since it was still inconceivable that Chaos Gods would trust and work together, so he couldn't block them and they struck at his giant death ball, causing a massive explosion that shuke the entire area with amazing force, aside the Lesser Chaos Gods, and Elder Daemons, the rest of the Chaos daemons could barely stand from the shockwave and tremors that occurred.
While that happened and Tzeentch was shaking off the pain, and ringing inside his head the trio rushed in for another attack.
Only for Tzeentch to quickly counter them, by sending all tentacles at them.
Those eldritch tentacles, wrapped around tightly on their bodies, but the trio refuse to become helpless under Tzeentch's grasp.
So they struck against the Changer with their respected way, serpents for Laharl, chains for Khorne, and parasite-tentacles for Nurgle all striking out and wrapping around the Architech.
This forced them into a deathlock, but also provided an opportunity to finally bring down Tzeentch, while they did manage to separate from Olympus, nothing was stopping the Changer from just teleporting back and start regenerating again.
So they intended to use the same plan as before, as the Dark One, used the powers of the Fel, Laharl open a rift into the depths of Olympus, far away from the veins of the mountain or the Core, plus the divine connection between them and Olympus itself will disrupt Tzeentch magical manipulation or even actually cast massive spells against them...once the rift, was big enough to fit them all, the trio of older Chaos Gods, used their greater combine strength, to push Tzeentch throught the rift and they began to fall into the abyss of Olympus' Caverns...