What if OC Primarch and the Thunder Warriors after Cadia's destruction

Enterprise

150 KM Long, 50 Km Width and at least 60 KM Height ship

Crew: 150,000

Imperial Guard: 15 Million

Skitarii: 5.5 Million

Mechanicus Adepts: 15,000

Thunder Warriors: 850,000

Praetorian Guards (Primarch's Honor Guard and the Only Super Soldiers that are Capable of Fighting the Custodes Toe-to-Toe with Rival and Surpassing Tech): 180,000

Elite Praetorian Guards: 50,000

Immortals (Another Branch of the Elite Praetorian Guard they are known to be Extremely hard to kill along with sheer refusal to die and too willful to let themselves killed) 15,000

Blank Thunder Warriors: 30,000

Titans: 1,500

Imperial Knights: 6,000

Hanger: 1 12KM Battleship/Battle Barge, 3 7KM Grand Cruiser/Battlecruiser, 5 5-6KM Cruiser, 15 Light Cruiser/ Strike Cruiser as their Escort (And No Escort Class Ships Since Light Cruiser/Strike Cruiser can be Considered as a Heavy Escort ships)

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Warp

No one knows how long they have been the warp, even the best of their calculation as they have been imprison during the Heresy by Tzeench since the Celestial Legion are the largest and most powerful Legion, because this are the exclusive thunder Warriors Bigger, Stronger, More resilient and better reaction time than the Space Marines and sometimes their best could challenge the best of the Custodes themselves

and sometimes they got out in the warp and have an adventure to different galaxy namely, Halo, Resident Evil, Star Wars, Mass effect, Warhammer Fantasy ETC

even then they never gotten back to their home reality and still been in the warp in the past few months and the ship being a self-suffient and protected not only by powerful gellar field but also being blessed by their priest to make sure that no deamon would able to breach them which they are not too worried about their supplies as they replish they could have supplies for a hundred years and they could grow their own food and their power source is almost unlimited as it was never lose power since it's very first voyage

"Months" P.Ronan muttered "Months that we have been in the warp compared to the years that for our stay in our fantasy counterpart" he said

"Well father we don't see a sign to escape this hell hole" Said Nath as he chuckled "At least we don't have that many casualties except for our guardsman as they are the on es who always take the brunt of casualties compared to us" he added

"I Think i found one" Said Emily the Ship's A.i. Materialize "We should take our chances before it close"

"Do it, better than being here forever" Said P.Ronan as he doesn't wanted to be in the warp even for a sec and they have occacional attack from chaos forces with endless demons at their hull and sometimes the chaos gods would join just so they could destroy him and his legion but they all failed

"Exiting the Warp" Said the Cogitator as they finally exit from the warp

"Finally we're in the warp... again" Said TW.Ronan with a sight of relief

"Praise the Lord we can see the stars again my brothers" said Arik with a sight of relief as well and as much as they wanted to defend the Imperium in the heresy traveling to other galaxy gave them new perspective in their view and gives them their already high tolerance to be more tolerance

"Emily" Said P.Ronan as he wanted to make sure that they are back to their universe

"Wait" Said Emily as she raise her hand "I've receiving distress signals region's alive with them... it appears we're finally return back to our galaxy again Thunderboy"

Once they heard it the loyalist cheered before they silent as they remember that Emily said about distress signals and they are going to help their fellow loyalist legion against the traitor legions

"Oh my god" Said Emily with a gasp

"What is it?" Said Titus as everyone look worried

"According to the timestamp... my lord... we are in the year of 999.M41" Said Emily

Everyone look stunned to hear that as they look at each other and then look back to Emily as Thunder Warriors and their Father change their expression to stoic as they're eyes begun to glow brighter

"We've lost in the Warp for over 10,999 years" Said Emily with a sad tone

"Tell us what's the distress calls Emily, i want to know if they are imperials or not" Said P.Ronan

"According to this frequency it might have change but they all imperials and even some saying words of God Emperor of Mankind" Said Emily

"Hmmm.... it appears Lorgar's dream come true, hah the Irony" Said P.Ronan with a dark chuckle as he still hated his father of forcing guilliman to destroy Monarchia until that day P.Ronan never forgave the Emperor of that decision and knows of his brother Guilliman was distress and he tried to mend the wounds between the two of his younger brother

It then Change to laugh which disturb those around him except for his sons as their Father can be unpredictable sometimes in his emotion even Emily have gotten use to this kind of behavior from p.Ronan

Especially when Said primarch has the 20 traits of his brothers along with their special abilities a reason why he is so powerful and deadly as a general, a Fighter and strategiest and a very Effective Ruler and administrator that surpass all of his brothers

"Yes, we can see that father" Said Arik with a sight 

"But continue please Emily, what other news?"S aid P.Ronan

"Hmmm... it appears a fortress world cadia was fallen. you know that location near to Eye of Terror?" Said Emily

"Yes" Said P.Ronan with a nod as he narrowed his eyes "Quite surprisingly that it held there for this long, they really put effort of defense"

"Indeed" said Emily with a nod of approval "It was fallen in Abaddon's hands"

"I would like to beat the shit of him and Kharn as soon as they show themselves father" Said TW.Ronan confident in his skills that he could beat the likes of them, even Sigismund was no match against the likes of the Champions of the Thunder Warriors only the Elite Custodians in their number could do, and TW.Ronan was known to fight Constantin Valdor in equal grounds

"Then we are returned not a moment too soon my Sons and people" Said P.Ronan as he finally stood from his throne "Emily sent course to Cadian System we maybe late for the battle but revenge is not over yet, it's only the Beginning" he said

"Prepare yourselves for this a War still lingers and i want full ready within half an hour" Said P.Ronan

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Scene Change

They arrive at the cadian system

With it P.Ronan talk and the people would hear his voice for the first time since the Heresy "To the Loyalist fighting for my Father's and Mother's name This is Belleza Primarch of the Celestial Legion to all imperial Vessel rally to this coordinates

This is isn't over, for i shall led you in your darkest hours"

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After saying that, the Galaxy was silent as those who heard him made a loud cheer as those who are hopeless fight with even greater streangth

The Ministorum rejoicing and thanking the Emperor and Empress for the Return son of their Ruler leading to their darkest hour

The Entire imperial forces that still currently in Cadian system fight harder just so they can't disappoint P.Ronan

The Space Marines themselves fights with greater ferocity not wanting to disappoint their uncle as their Father their Primarchs loves and respected their Eldest Brother and so they are ready to follow his command without question

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And Done

See you Next time Folks