Spell 1: Beginning

-France, world war 2-

"It appears that Grindelwald and Adolf had failed, lord Heydrich."

Mercurius reported to a man with long flowing golden hair wearing Gestapo officer uniform looking down on the remains of a burning city.

It is a massacre carried out by mere three people, the great generals of the LDO, the Longinus Dreizhen Orden. Overlooking the operation is the leader of LDO himself and his most trusted associate, Reinhard Tristan Eugen Heydrich and Mercurius who is also known as Karl Craft. Heydrich is not surprised at all with Grindelwald and Hitler's defeat. Instead, he nodded.

"It is fine. I have expected such an outcome. We have collected enough souls for the time being."

"Indeed we have. While we cannot complete the ritual right now we can still do so in the future."

"Then let us depart. Open the gate to Gladsheimr and then order the rest of the LDO to prepare for when the ritual can begin once again."

Mercurius bowed in acknowledgement.

"All shall be as you ordered, my Lord."

"Hmph, you call me your lord but you are stronger than me, aren't you, Karl?"

With a smirk, Mercurius disappeared.

Not very far away, another forces is pushing through the defenses of the Nazi soldiers under commander Heydrich. Unlike the normal Nazis or the wizarding Nazis under Grindelwald, these are undead soldiers made from the power of Heydrich himself. They are different from the Inferi, much stronger, faster, and immune to most form of magic. Only the highest rank magic with high destructive power can destroy them. That is why the advancement of the special unit is slow, although, it is still much better than what any other units can do.

The special unit consists of wizards and witches as well as exorcists who are trained especially against enemies of this kind, the supernatural. But even if they are the best magical corps in the allied forces, Heydrich's undead soldiers are strong. Despite being the most elite unit that even the famed Grindelwald feared to face, they are not making much progress in face of the LDO.

"Damn that Dumbledore for assaulting Grindelwald's fortress right on the same day as our final assault. Now we're lacking manpower to make the final push. Lieutenant Schwagerin, are the civilians safe?"

A Japanese soldier with the rank of captain wielding a massive black sword that destroys magic in his right hand and a red gantlet with green jewels on his left hand, Sakurai Kai, asked a short redheaded German turncoat officer with the rank of lieutenant named Anna Mariea Schwagerin who is frantically casting spells with her want at any undead soldiers coming their way.

"Scouts reported that the three generals of LDO have begun harvesting souls. Every civilians still in the vicinity are dead!"

"Tch, so we're too late huh?"

"Captai Sakurai!"

A man shouted from behind him, a middle-aged man with messy brown hair wearing priestly clothing. It is one of the exorcists assigned to help them take down Heydrich and commander of the exorcist battalion.

"Father Trifa?!"

"Mercurius had opened a gate to Gladsheimr!

At this, the Captain widened his eyes and look to the distance. Like Valerian Trifa said, there's an illusion of a castle made stones and dead body appearing above the French town. It is the fortress Gladsheimr. Whatever it is doing up above the town is unknown but it can't be good.

And then they saw him, they saw Mercurius floating in front of Gladsheimr with arms spread wide. Mercurius, the most dreaded member of LDO second only to Heydrich and the blonde monster's closest confidant. He still has that irritating smile they came to hate plastered on his face.

"You were too late, ladies and gentleman. We were just about to take our leave. This might be a disappointment but it cannot be helped."

Everyone grit their teeth when they saw Mercurius… that is until someone arrives. Mercurius saw him coming and his eyes widened for a moment before he smiled in glee. A man had just arrived on the battlefield and all eyes turn towards him when he arrived.

He is a young man in his early twenties but his presence exudes an aura of power comparable to Mercurius himself. The most noticeable thing about the young man though is that he is not alone. Behind him floated the spectral form of a beautiful blonde girl with long curly blonde hair in a pure white dress.

"So you have come, Lotus, Margueritte."

The man is Captain Lotus Reichhart and along with him is his partner, Margueritte Breuil. They kept moving forward until they stopped several meters in front of Captain Sakurai and look up to Mercurius.

"Mercurius."

"So you have come to bid us goodbye, ohh Eternal Twilight."

"I am here to make sure that this goodbye is forever, Mercurius."

"Ahahaha, very well, one last dance then. Shall we?"

Lotus did not say anything. He simply extend his right arm and pull his sleeve to his bicep. Marie then disappear as Lotus' right arm began to radiate immense power and turn blue with red veins as a blade extend from his arm and curve forward. This is Margueritte Bois Du Justice, his weapon.

"Lotus, what are you doing?"

Anna asked when she saw the grim look on his face. Lotus did not turn back to even look at her and said only three words.

"I'm sorry, Anna."

"Lotus!"

And Lotus Reichhart charged at Mercurius.

Almost half a century later, Mercurius who is not fully present in the physical world watch as time moves on. One thing caught his attention when he was preparing for the upcoming continuation of their ritual that was halted several decades ago.

In the 1970s, he caught wind of a rising new Dark Lord known as Voldemort. Mercurius chuckled at seeing the man. Superiority complex and everything, thinking he's so smart and everything is about blood purity when he's not even a 'pureblood' as he called it. If his old foe, Lotus Reichhart and his allies are still alive, this so-called Death Eaters wouldn't even last three days. And soul containers? Really? Well, he supposed that soul magic is not something humans could delve deeply without the assistance of a divine being like him. Voldemort is not interesting or powerful enough to even warrant him dropping a hint to true immortality but he does have his uses like causing chaos and conflict where he can harvest souls.

But then everything changes in a Halloween night during the 80s. He felt a familiar presence but not as intense as he remembered it to be. He got curious and in his spiritual form, found himself inside the bedroom of a house hidden by fidelius charm. While it is an impressive piece of magic, such things are still nothing but parlor tricks to a god like him. And when he entered the room, he saw a child, a mere baby, but he radiates a warm but powerful, familiar presence. There is only one reason for that.

"A Longinus, one of Margueritte's creation."

Mercurius concluded. The Longinus Sacred Gears, thirteen very powerful weapons that Margueritte made based on his Relics as means to combat him several centuries ago. It was made as a challenge to him, her Longinus against his Relics. But that is fine, it even works to their advantage after all, with the power they have, very little can oppose them, especially Lord Heydrich and himself, so it is better if their opponents can fight them on even terms.

After all, fighting against an enemy far weaker than them is a mere massacre and murder and it is certainly not a war. Only when two forces of equal power fought can it be called a war, and a war is what they needed, and Mercurius has the feeling that this one will be useful to him. This child is born under a certain destiny, a destiny that would always lead him to conflict. Mercurius then smiled.

"A prophecy, I see. Very well, let's see how you would do, child.

And Mercurius waited.

He saw the boy's several months of peaceful life among his family and their friends. He saw when one of their friend betrayed them to the current dark lord in reign, and he saw as the father fell to said dark lord. He saw the mother attempting to plead for her child's life. He saw everything unfold in front of his very eyes as if he's watching some movie.

And then it happened. Just as the dark lord slew the mother, he pointed his wand at the little baby boy. Truly mortals are amusing. This foolish dark lord is afraid of a mere baby just because of a prophecy. Utter idiocy. It is this very action that made these so called prophecies powerful and is actually the start of his downfall.

And so when the dark lord uttered the spell that would've ended the child's life, Mercurius was not surprised when he felt the Longinus inside the boy reacted. While it did not activate, he could feel Margueritte's blessing coming from the Longinus and the Goddess' power reflected the spell back at the dark lord.

He then watched him being taken by a half-giant to the arms of an old man he recognized as an old friend and final enemy of Grindelwald, a certain Albus Percival Wulfric Brian Dumbledore. To see Dumbledore again after so many years, it even brought nostalgia to him of the days of world war 2. Which reminds him, the LDO need to move soon and they will need new members and he will have to choose them carefully. A lot of their comrades were killed by Lotus and his people during the war.

But before that…

"Your fate will be better off in a place far from here, child. Yes, you will do. You will give us, give me, the war we desire."

Mercurius picked up the child from the front door of his relatives, and Harry Potter is never seen again for years to come.

-5 years later-

Harry Potter, or as he is known now as Dulio Gesualdo, the adopted son of the Gesualdo family in Italy, is running for his life.

'Run Dulio, run!'

Those were the last words he heard from his father before purple flame engulfed him. His mother had been killed earlier by an attack from some soldier with skeleton face. He is tired, injured, and confused at what's happening. Just an hour ago he was having lunch with his family like usual and then suddenly now the whole town is burning with purple flame that makes a cross that rises high up to the sky.

Then his father called someone before rushing in to fight those scary monsters that came after the flame with some sword made of light and a gun. His mother followed him and they fought bravely… until they met a woman with messy black hair dressed in some Victorian era clothing.

That was when his parents were killed by the woman who seems to control the flame.

He also saw many strange things happening. People controlling fire and blasting things with pointy sticks fighting each other though it seems the enemy is the people wearing black military uniform that works together with the skeleton soldiers.

As he was running, he tripped on a broken pavement. He fell and then heard a growl from behind him. He turn around to see a masked man in black military uniform with an officer's cap on his head. It is one of the enemies. He pointed a glowing stick at him. Dulio had seen what that stick can do and close his eyes in acceptance. He will be rejoining his parents soon, all of them.

But the death never came as a golden fire in the shape of a snake consumed the man's body. The fire came from behind him and Dulio saw a woman in nun's clothing holding one of those sticks. She has long flowing golden hair that seems to glitter under the sun. She rushed to him and put away her wooden stick. The woman knelt in front of him and looked at his injuries. She then place her hand over his injuries and a pair of rings appear on her fingers, one in each hand. Dulio felt the injuries he sustained from running through a battlefield disappearing.

"Are you alright?"

The young woman asked. Dulio nodded. Then he saw a hand being placed on the woman's shoulder. He look up and saw a man with brown hair and asian features in a suit.

"Ise-san?"

"She's here, Asia. Take the boy and leave. I'll take care of the rest."

The asian man called Ise-san told the blonde nun whose name appear to be Asia. Dulio's head turned towards the street where he again saw that woman with messy black hair that killed his parent. Then suddenly something appear on the asian man's left hand; A red gauntlet with clawed hands that reminds him of a dragon.

Dulio then felt himself got picked up by Asia. The nun nodded to the man who smiled at her. She then began to run with Dulio facing backward. Dulio watch as the man utter two words that would leave him in awe.

"Balance… Break."

So here is the rewrite. This time there is no dimensional travelling or anything and I blended all three worlds into one. Once again as a reminder, this is a crossover between DxD/Harry Potter/Dies Irae but with the blend, I have made this strictly happening in the HP world instead of DxD characters got pulled into the HP world by dimensional travelling. Though don't expect non-human DxD characters to appear and even if they do appear, they will be humans. So I don't want to hear 'someone getting turned into a devil' or something similar because the devils do not exist here. What I took from DxD are the human characters and the sacred gear system which in this story is not made by God but by Marie who is a Goddess from Dies Irae. I hope that's clear enough. This is still a Dulio is Harry story but instead of being summoned when he was 17 to the Triwizard tournament, this story will have Dulio attend from Year 1. He also had not gained any meaningful mastery of his Longinus but he will be a trained combatant, very trained, both in hand to hand and magic because Asia and Issei will train him. And yes, those two are Asia Argento and Hyoudou Issei. Though in this story they are much older than their canon self. Asia and Issei are around 25 or 26 when they met the 6 years old Dulio/Harry.

Harry Potter characters will also be more involved since this story starts from the Philosopher's stone. There will be some Dumbles bashing but since I'm not very good at it I'm not sure if it will turn out well. Also, don't expect a harem for Dulio. If you know your DxD, it won't work. His pairing has been decided.