4 Of them heading towards the incomplete halo to finish the fight The survivors has already in the Shadow of Intent and have returned to Earth While the Macragge's Honor will stay The Utlramarines are waiting to their Primarch's Return to their ship and should he needed help they will reinforce him with full force.

The Moment they land and advance they were ambushed by the Flood and the fight begun.

Just like before They could not stop the 4 of them, They always looking for each other covering their weakness, Guilliman always takes the front.

They all make haste to the Command center in the Halo, Once they are inside Guilliman was force to separate with them again as it the door is not fit to him, he find another way.

He did not stop until he reach it.

Guilliman saw a large number of flood attacking at him, He charge forward Cutting,slashing,punching and bolter round killing them instantly as each group that try to attack him were fail.

But the moment he is near to the command center he saw Sarg.Johnson laying in the floor mortally wounded while Chief was fighting the Monitor

"Chief!!(he shout) What happened" he ask as his eyes trained to the monitor

"He shot johnson mortally wounded him" he Replied

"I WILL NOT ALLOW YOU TO DESTROY MY INSTALLATION" He shouted in anger as he is glowing in red burning in rage as he shots laser towards Guilliman luckily the shield absorbed it.

Guilliman charge towards the Monitor while his Hand of dominion powering up it took him 5 seconds to reach the monitor and Punch it flying towards several walls while screaming

Guilliman approach the 4 people Chief bend while the Arbiter stand also Guilliman stand while looking at the dying man.

"I'm getting out of you here" said Chief to johnson

"No, no your not(he hold chief's hand) Don't ever let her go(Cough) send me out with a Bang" With those last words of Sergeant Major Avery Junior Johnson, He close his eyes forever

After putting his hand to chief it was revealed an A.I. Chip

https://youtu.be/Daqowcjf7hU

Chief put Cortana to the Control

"Chief i'm so so sorry" said Cortana in a sad tone

"He is an honorable warrior master chief" Said the Arbiter

"He will be remembered don't forget his sacrifice Master chief" Said Guilliman

after that cortana set the halo into self destruct.

All of them run Chief and Arbiter have a warhog but Guilliman was force to run all of them running

Chief is the Driver while the Arbiter mount the gun

the 3 of them Run without stop until they separate again as large tower fall.

"Don't worry about me just Go" shout Guilliman they nob to him and they continue to run it was not long a stormbird spotted Guilliman

'We are here to rescue you Father" said an Ultramarine 

Guilliman did not waste anytime he board the stormbird and fly towards the Macrrage's Honor

it  took them 30 minutes to board his flagship Guilliman saw the Forwards Unto Dawn flying towards the portal

In the Brindge

"Full Ahead full NOW!!!" Said Guilliman

The Macragge's honor thruster were full power towards the portal

Guilliman saw the Halo explode 

They have successful to the enter the portal but what Guilliman shock the Forward Unto Dawn was cut in half and craft to Earth.

He hopes the his companions live.

Timeskip

They are ceremony to honor their fallen ones Only the Arbiter survive and Master Chief John-117(Yeah he knows his names it was Chief the one who tell them)

There was many picture of the dead including Miranda Keyes and Sargeant Avery Johnson

It  saddened to Guilliman that John did not survive

Lord hood remove his hat and begin his speech

"For us the storms has pass the war is over but let us never forget those journey to the howling dark and it did not returned their decision required Courage beyond measure sacrifice with unbreakable conviction their fight Our Fight was elsewhere as we start to rebuilt this hill side will remain barren a memorial to heroes fall they will live in all of us and they shall not be forgotten" he put his hat after he finish his speech

He salute then the Marines fired 21 gun salute for their military honor

Both Roboute Guilliman and Arbiter approach Lord Hood

he turn towards the Monument

"I Remember how this war started your kind did to mine i can't forgive you(They face each other) but you have my thanks" he extend his hand to shake "For standing by the End hard to believe his dead" the shake hand

"Were it so Easy" the Arbiter said as it was those words he said to the Spartan he then looked to the sky were both the Macragge's honor and  Shadow of intent flying lazily

he then turn to Guilliman

"As well as you Roboute Guilliman savior of our Galaxy you may not be in this Galaxy but you still saved us" He to Guilliman 

"It is an honor to serve you Lord Hood  as well as the Master Chief john-117 and (He turn to arbiter) Arbiter it's been honor to fight alongside with you and this will be a worth a tale to my Galaxy to my Father Empire, to my Realm of  Ultramar and to my allies i will tell them my tales of this galaxy and they will remember this, as this the first time we travel to another galaxy i already given you our history and learn with it no matter how humanity fallen they will always stand as long there is hope" said Guilliman as he put his left hand to his chest

"I hope we shall each other Again" Said Guilliman

"I hope Lord Guilliman" 

"It will an honor to fight alongside with you again Lord Roboute Guilliman son of the Emperor and Empress" Said the Arbiter as he too put his fist into his chest

"AVE IMPERIUM" with that Guilliman teleported to his flagship

In the Bridge

"My Lord Our Navigators have pinpoint to our Galaxy" Said the Space marine

"Take us hone Galaxy" Said Guilliman 

then his face appeared to the screen so all Space marine(Even drednoughts were awake at the reqeust of their Primarch), and Humans 

"Today we have discovered that we are not alone in the galaxy they are many galaxy out there with different reality different humanities with that we are the first imperial to prove it that we are not alone, Today we saved a besiege Humanity in this galaxy despite of losing they kept going on just like us, they fight another alien group of alien race want nothing but the destruction of humanity, but they were trick by their leaders with that they want redemption to these humanity and they prove themselves to be a great allies

Remember these my sons tell these to next Generations of Space Marine and all Legions that we will always aid our brethren even they are not in our Galaxy" 

Then Guilliman collect his voice

"REMEMBER WE ARE THE DEFENDERS OF HUMANITY AND BULWARKS AGAINST THE TERROR"

"COURAGE AND HONOR!"

"WE MARCH FOR MACGGE!!!" He shout at the top of his lungs

"AND WE SHALL KNOW NO FEAR"

The the ship enter towards the portal returning to their home galaxy and tell the tale

____________________________________________________________________________________________________

Epilogue

TERRA

Imperial palace

3 decades have pass since Guilliman visited that galaxy

He and His Ultramarine Legion and the Macrrage's honor Journey to the other Galaxy has been has told to the entire galaxy and they were many has been shock that they are not alone and he is return as hero to the Imperium ha he journey to the unknown of different galaxy and it was retell from generation to generation of space marine as they gave them videos of their journey as in his fortress monestary has been recorded it and they will make sure it will never fade in history.

Guilliman stared at his Mother the Empress of Mankind as the 2 of them walking around the Palace

(Yes that's Sailor Moon the Empress of Mankind wife of the Emperor of Mankind)

"Why are you here my son" She ask to Guilliman

"Well i have something to ask Mother"

"So speak freely Roboute" she said

"Well during my journey to the Other Galaxy an A.I. Named Cortana called me Lord Smurf and sons as Ultrasmurfs" He said to his Mother as he is unsure what that word mean as Cortana mention it those are in 20th century so Guilliman his Mother Lived that time

The Empress Begun to laugh at his word

"Oh my poor Roboute" She touch his cheek from her small hand

"Well During in my time the Smurfs are fictional creatures " She said as she waved her hand a Blue creatures appeared

"These are the Smurfs Roboute and it's Suits you and your Sons the Ultramarines cause your armor are blue as them i sometimes called you that during the crusade but you weren't paying attention enough and do not take this as an Insult" She giggle at the last part

"Thank you Mother for telling me this, i hope my brothers will not going to call me this" said Guilliman

"I hope so my son" She said

"Now go back to your Realm they need their Lord" said Usagi the Empress

"Goodbye mother" Said Guilliman

"And Goodbye to you my Son" Said the Empress with a sweet voice

With Guilliman gone

"Well at least i'am not alone of calling him that" Said the Empress with a smile