835. M 41 Segmentum Solar Terra, Imperial palace.

Ten Thousand years have passed since the Emperor became the sovereign of mankind. The Daemons and Xenos that tried to defeat Him fell to the powers on the innumerable armies of mankind.

Some of the Xenos were allowed to develop but only as a part of the Imperium. The only exception being the Eldar, as they had their own separate state in the place were the Eye of Terror resided, but those worlds belonged to them originally and rightfully.

For such a long time, managing millions of worlds has become a routine, from which He is tired, but could not leave. Because if He will leave the horrors of the Long Night may return.

One day something that He could not have foreseen happened, as the Emperor felt a splash of some dark energy all the way from another Galaxy. This energy was so dark and chaotic that it caused him serious concerns.

"Malcador, call them all."

"My Lord, it shall be done."

A month later, after the Primarchs finished their campaigns, the Emperor's genetic sons began arriving on Terra at the head of their Space Marine Legions.

Will all eighteen of his sons gathered in the Throne Room, the Emperor appeared before them bearing grave news.

"My sons, from outside the borders of our galaxy a threat is looming that can destroy everything that we have achieved. We must take action immediately."

"What is your will Father", asked the Emperor's Favorite Son and the Greatest of All Primarch: Horus Lupercal.

The sense of urgency this new threat gave to the Emperor manifested as strongly in four of his sons, those being: the afore mentioned Horus Lupercal, the Warmaster of the Great Crusade since the Triumph of Ullanor and Primarch of the XVIth Legion, the Sons of Horus, Leman Russ, Primarch of the VIth Legion the Space Wolves and the Executioner Imperatora, Rogal Dorn the stoic leader of the VIIth Legio the Imperial Fists and Praetor of Terra, lastly but certainly not the least, Sanguinius, the Primarch of the IXth Legion the Blood Angels and Angel of Baal.

Grinning, the Emperor replied: "The Adeptus Mechanicus is currently completing the construction of a Gateway to the galaxy from which the threat emanates. Alpharius , Omegon, take your whole Legion. You will go first and once there your objectives are: finding out the location of the worlds inhabited by intelligent life, what forces are dominant in that galaxy, collect all the possible information and return by building back the Webway Gates on the other side. For this purpose, a fleet of Tech-priests of Mars will go with you."

"Father, Your Will shall be done!" said Alpharius, the public Primarch of the XXth Legion with enthusiasm and eager to explore this new Galaxy just as much as any of his Brothers.

After the meeting was adjourned, Angron the Primarch the XIIth Legion approached Alpharius, concern evident in his voice.

"I hope your Sons are ready for the upcoming Crusade."

"My sons are always ready just as well if, not more than yours brother", Alpharius bantered.

"Then I look forward to hearing your stories, especially the parts were Omegon prooves the better Primarch by those he finds to save your trouble-looking metal plated arse", Angron teased back.

Horus spoke immediately :

"If something goes wrong, I'll come to the rescue.

"Like all of us!", added Robout Gilliman "Because we are brothers and we will not leave each other in trouble."

"Thank you all." commented Omegon.

"Personally I'll come even if it's to be the first to hear the stories about how Omegon prooves the better Primarch by saving the Legion core by hiring the right person to save your trouble-looking metal plated arse", Angron teased back, which causes the twin Primarch of the Alpha Legion to groan, Roboute to proclaim a triumphant 'See' and the rest of his brothers to chuckle at said Legion's previous attempts of becoming the best and efficient that the Great Crusade could have asked for.

Normally Angron wouldn't have had reason to banter or to joke or to be friendly to any of his Brothers, especially the Ones who chose to shroud themseves in secrecy and shadows and cowardice, but being free of the Nails and the help of the Emperor and Magnus without having to worry about the Golden Throne it allowed Angron's old self to slowly appear and to fix his Legion.

What one wouldn't expect would be that the once Berserk Twelveth became stronger after being freed by those Infernal Devices, just look at Kharn if you find his Brothers' description lacking.

Or that Angron and the twins bonded by pranking stick-up-his-arse-Roboute, but here they are against all odds.

With that out of the way, Alpharius and Omegon turned around to prepare for an expedition into the unknown.

It took almost six months to collect all of the Succesors of the original members into a single Legion.

They flew from different parts of the Imperium to reunite with their Genefather. Upon completion of training, they arrived in the Alpha Centauri system which was were the Gates that fed directly from the three stars were being built. Waiting with the Exploration Fleet was Archmagos Dominus Velizarius Cole.

"I welcome you, offspring of the Omnissiah."

"Greetings to you too Archmagos . Is the gate ready to go ?"

"Yes, the gates are operating in optimal mode, the transition will take 1.3 standard Terran months.

"Excellent. What manpower we have", asked Alpharius, deciding that for such an occasion he'll attend personally until they reach their destination.

"Five Legions of Skitarii and Legions of the Titans Legio Mortis", replied the Archmagos.

"Then we leave immediately. This threat cannot come to our worlds. Therefore, we go there."

"Sir, on my orders, probes were sent through the gates. According to their data, in that system there is only one inhabited world, which is a desert planet. The population does not exceed 200,000 living things. Also, in that galaxy, the Gate should also be built to establish a permanent connection with the Imperium ."

"I understand Archmagos. This world and this system will become our springboard, and no one will stop us. In the name of the Emperor and Humanity!"

The huge Alpha Legion battle fleet, which consisted of a dozen battleships and battle Barges and hundreds of cruisers at the head of the Alpha, the Legion's flagship , moved through the portal. It is not known what awaited the participants of this expedition, but they were ready for anything, for such was how they were created by the Emperor ten thousand years ago.