A/N – Another story in Warhammer 40k x Harry Potter, this one based on a challenge from The Zombie 3xecutor. "your OC will be a member of the emperors creed chapter, this chapter spreads the old religions of earth and removes chaos worship religions, they will either be rank of chaplain or captain, how they arrive in the world is up to you, main difference for chapter is no auto worship of the emperor, all changes are caused by genetic manipulation and retains sex drive, any pairings are you choice." – No old religions, but the Imperial Truth, no chaplain or captain, at least not now. Sex drive, gene manipulations yes and few more things.

o-0-o

Ork WAAAGH was one of the most destructive things in the known galaxy, seething tides of bloodthirsty greenskin warriors that counted in millions, if not billions of beings were able to conquer and pillage star systems in weeks or even days. Even heavily defended and prepared systems had problems stopping the tide from washing over the defenses ready to face it and kill everybody. Argentum V was neither important enough to house a large Astra Militarum garrison nor was warned ahead of time to prepare for the coming of the horde. So when the meager forces assigned to chase away pirates were smashed to pieces by a dozen of Battle-Kroozers the only thing left for the inhabitants of the world was to pray to the Emperor and send a message demanding support.

Since that day three weeks had passed and most of the previously beautiful world was now destroyed or under siege, hordes of greenskins laying siege to last few hives that managed to survive their ceaseless assaults. There was no hope to the world as defenders of almost all hives were upon the brink of exhaustion and most of their supplies were running out.

o-0-o

High Lord Aurelian, a Space Marine with over ten centuries of experience, a mane golden hair and keen blue eyes, stood on the bridge of his flagship, a battle barge, called Shangri-La's Honor and watched as a massive armada of his chapter prepared to leave the Warp. The cry for help for help from Argentum came at a perfect moment as his whole chapter, Emperor's Creed, was gathered in the fortress for ceremonies and yearly tournaments. The second the message was deciphered and delivered to him things happened quickly and now he stood in his purple and golden Tartaros Pattern Terminator as ten thousand battle-brothers prepared for combat.

Shangri La's Honor left the Warp as close to its target as possible, the moment the transition happened he looked at the data presented on hololith displays. Around the planet, there were scores of Ork vessels, but they were the lesser problem as not many fleets could stop the focused might of his chapter's ships. Over two hundred and fifty strike cruisers and battle barges now hurled through space, their courses plotted to bring them to the planet in the least amount of time.

"We are just in time," Lord Traian, commander of the 1st Chapter said. "Few more days and the planet would fall."

"Aye," Aurelian said and looked at the helmsman. "Bring the fleet as close to the planet as possible. Allow us to deploy in the pods and engage the enemy. Thunderhawks are to deploy our vehicles when possible."

He saw the helmsman nod and then he turned to watch the beginning of the fleet duel as Orks started to move to engage his fleet and try to stop it from reaching the planet. At this he just smiled, their main problem would get a lot less troublesome with their enemies robbing themselves of orbital bombardment.

"Orks, so predictable and stupid," Traian said, slowly shaking his head. "Since the time of the Crusade they didn't learn a single damn thing."

"At least this time they chose a somewhat surprising target," Aurelian said and took from a serf his massive axe and a storm bolter. "One that most pirates and Chaos warbands avoid as we patrol those areas."

"And we should have a warning that something was coming."

Aurelian nodded and checked his gear before glancing at the map and then at Traian. "Hive Dominus was conquered and it shouldn't have happened so quickly."

Traian nodded, his silver hair bristling. "We have a traitorous scum to catch," he spat. "May I request permission to lead the strike at the Hive?"

"Permission granted," Aurelian said and added before Traian walked away. "I'll send 2nd and 7th once they achieve their objectives."

"There will be no need for them," Traian said seconds before doors close behind him.

Aurelian nodded and moments later he also left the bridge, at his sides moved his bodyguards, ten warriors personally picked by him. All of them clad in purple Terminator armors with pelts of massive lions hanging down their backs. He entered the level where were placed drop pods and their launchers and stepped into one of them, while his guards would ride in two more pods. He strapped into the seat and waited, second dragging like hours for him as he prepared for combat and delivering justice to the orks.

o-0-o

Defenders of hive cities of Argentum prepared for the last day of fighting when the sky slowly lighting up with the morning sky was crossed by hundreds, if not thousands of drop pods. Each of them was carrying Emperor's Angels of Death to free the world from the scourge of orks and to liberate its people.

At first, they thought they were seeing things, but when the vox network was filled with the combat chatter of Astartes and if there were any doubts, they vanished when first pods slammed into the ground and opened, releasing their deadly cargo. While this event filled the hearts of the defenders with hope, it filled the heart of the Ork Warboss with fear and uncertainty. He didn't expect Astartes to come and fight him.

o-0-o

Aurelian left his drop pod that smashed into the middle of some mob of orks and only smiled when they charged at him. Before first even had a chance to get close he started to fire and bolter rounds started to pierce bones and flesh. Looking at the sides he could see his personal bodyguard land and join combat, their trademark halberds and storm bolter cutting down swathes of enemies. He looked at them and then focused on the orks, his massive axe slashing at the orks in front of him and cutting them down.

Moving forward through the thick of combat he could see more and more of his Astartes join the combat around him. Precise and cold bolter fire killing every single ork that crossed their path, showing the perfection of the training given to all of the Marines at the beginning of their service and later honed in the cauldron of war.

He glanced at the sky and he noticed a flight of Thunderhawks pass overhead and slow down for a second, yet long enough for them to release their deadly cargo. Mag-locks were deactivated and vehicles were dropped, almost immediately joining combat and bolstering his forces.

o-0-o

Traian moved forward as several bolter rounds bounced off his armor, he located the place from where the fire came and he pointed his assault cannon in its direction and watched with satisfaction as bodies of traitorous PDF soldiers were torn to shreds. Looking around he saw his brothers steadily push deeper into the hive, mercilessly slaughtering orks and PDF soldiers that were on their path.

He moved his lightning claw in a wide arc and watched it rip apart bodies of those enemies that got into his path, he stopped with it a strike of a choppa and with a quick push ripped open the chest of the ork that attacked him.

"Where's our support?" he asked, activating vox of his helmet.

"On its way," came reply moments later. "Spartans, a squadron of Whirlwinds and Vindicators will be in three minutes. Sicarans are engaging enemy Gargants to the west and once the task is done they will join you."

He nodded and climbed onto a large fountain that so far remained undamaged and looked around. In front of them was a teeming mass of orks and PDF forces. While behind there were hundreds of his own warriors, their purple armors shining in the sun. Further behind he could see battles rage all over the countryside as forces of the chapter steadily pushed forward.

o-0-o

Several hours later Aurelian looked at the surrounding area and he could only see piles upon piles of ork corpses that were slain by his chapter. In the distance, he could see fires of war still rage as companies drawn from all ten chapters cleaned their surroundings from lesser mobs and warbands of orks. It was just the beginning of a much longer and bloodier campaign, but the worst part of it was done, now what was left to be done was clean up and reconstruction of the destroyed infrastructure. As well as tracking down of that traitorous

o-0-o

Traian ripped the head of an ork away from the rest of the body and smiled when he noticed the governor sweat in fear. A look at the sides confirmed his suspicions that the squad of Terminators that came with him finished dealing with the remaining enemies.

"Well, governor or should I say, former governor," Traian said walking forward, lightning claw in his left hand crackling with power. "I think that your tenure is over and that you can be executed for treason and scheme against the Imperium."

The governor let out a feeble sound and Traian smiled before he grasped the traitor and threw him towards the Terminators. "Take him to the cell and ensure that he faces justice."

He looked around and have the room one last look before punching a hole in the wall and stepping outside and out of the building. His mission was done and there were hundreds of pockets of resistance that needed to be eliminated.

o-0-o

Harry woke up early and sat up in his bed, last eight years of his life were like a paradise to him, after somehow he managed to escape the Dursley's and landed in this strange world he had a family that cared about him and didn't have any issues with getting new friends. He grew up in the city of Shangri-La and in the shadow of a massive fortress located in the middle of it, a complex that served as the headquarters of the Emperor's Creed chapter.

It was also the reason of his excitement, today was the day when all of the male teenage students that were fourteen or older passed Choosing, the best of them being chosen to join the ranks of the chapter. He quickly dressed and grabbing a bag with his supplies he bolted out of the house, hurriedly shouting goodbyes to his adopted parents and siblings. It took him few minutes to get to the school which he attended and when he entered the biggest hall he saw all of his peers and friends from the year, the Headmaster and five towering forms of the Adeptus Astartes. All of them were clad in purple and gold armor, however, three of them didn't have helmets covering their heads and instead showed stone faces, impossible to read.

"We will disperse with formalities as there is no need for them," one of the Marines said. "I'm Apothecary Quintus and I'll oversee the Choosing." He jabbed his finger in a direction of one of the Marines. "First you will follow Sargeant Scipio who will take you to a place where you can change clothes and later pass a fitness test, then you'll come back here for an academic test. Other chapters don't care if they get idiots or smart people, but we care, so if you want to choose as an Aspirant you better not slack off."

There was a lot of grumbling at those words, but they nodded and formed into even columns in front of Scipio who gave them a cursory look and motioned for them to follow him. They passed through the maze of corridors and emerged in the changing rooms. "You have five minutes to change," he barked. "Everybody late will have a five minutes penalty added to the end result."

With those words he walked out, avoiding slamming his head into the ceiling and left them to change clothes. Harry gulped and bolted for the nearest locker before hurriedly starting to change clothes. He knew that being a Creed was a huge honor for the family for the millennia to come, yet he never was told that it could be so hard to become one. He quickly dressed in his workout clothes and walked out of the room and stopped in front of Scipio who awaited them in the next room with a smile on his face. At this Harry felt a ball of ice grow in his stomach, it reminded him of a teacher that came up with a particularly nasty test.

o-0-o

A/N – Chapter:

Emperor's Creed:

Strength - 10000 battle-brothers

Organization - 10 regiments, each 1000 battle-brothers strong and divided into 10 companies each.

Primarch - unknown, two additional organs reported, otherwise stable and pure.

Heraldry – the oldest symbol of the Imperium, an eagle head with thunderbolts crossed behind it.

Color scheme – purple and gold with silver details

Homeworld - Fifteen Worlds of Creed, capital and location of the fortress, Shangri-La

Leader - High Lord Aurelian

Fleet - 50 battle barges, 200 strike cruisers – 5 and 20 per regiment.

Recruitment:

-10% sons of current Marines, 12-14yo

-35% sons of the cities and civilized worlds, once a year recruitment from 13-15 yo teen males. Chosen based on academic performance and physical fitness. Each potential Aspirant needs to pass a set of tests, an academic one, and a fitness one. Those that fail one of them are offered spots as human servants of the chapter and crews of its ships.

-55% barbarians from the primitive regions of the realm. Survival of the fittest and coming of age trials, chosen based on their ferocity and killer instinct, 12-17yo

Training in barracks outside of the cities, in the wild. Teams mixed from all groups and brought to the same level of fitness, knowledge and combat abilities. Dropouts offered places as human servants of the chapter.

No psychological conditioning and once the transformation is done they have issued power armors and assigned to chapters. Scouts are drawn from those that show an aptitude for hunting and scouting.

Chapter keeps a very warm and open relationship with the inhabitants of Shangri-La with their fortress being constructed in the middle of the capital and outposts in other major cities.

Specialty - Massed Terminator assaults, planetary combat. Access to some Heresy era gear and work with Tau and Eldar, resulting in often clashes with the Inquisition.