Again, this is a story written by a novice writer who has no idea what the hell she's doing. The only research on DxD I did for this chapter is the year the Great War occurred (a few thousand years ago), and even that's not very useful since this is an AU where the War happened somewhere in the 15th century.

I also could not find out anything about Lucifer's powers through the wiki, so I went "FUCK IT" and gave him Destruction. Sue me.

Lucifer ran.

They were after him- a veritable wave of angels, spearheaded by none other than Michael the archangel himself. He gasped from the pain as another wave of spears, swords and other bladed weapons made of light came raining down on him, leaving black scorch marks where they struck.

"Damn you!" He screamed. "Damn you all to Hell!"

Michael looked at him sadly, pity evident in his eyes.

"It truly saddens me that I must do this," he called out, "but I must."

A giant spear of light formed in Michael's right hand, and the angel leaned back, arm poised to throw.

"I bid you farewell, my brother. Please, forgive me, and may you find redemption within the arms of our Father."

The arm came swinging down; the spear leapt from his hand and sped towards the Morning Star, eager to pierce its enemy. Lucifer had no time or energy to react, to defend himself, before the spear impaled his heart and sank into the ground behind him before disappearing.

Blood spewed from Lucifer's lips, tainting the scorched and cracked ground black as it greedily absorbed the moisture. He stretched out an arm towards the rapidly blurring silhouettes of the angels, seeing a strange shimmering in the air before him- wait, shimmering?

Lucifer's eyes widened at the realization, as he was forcefully yanked away, to an entirely different realm.

Lyra had been a simple village girl in the small farming community of Holt. It was a small and rather impoverished town- bouts of flu and pneumonia killed off around a quarter of the villagers each year, and Lyra herself hadn't been given a name before her fifth birthday, her parents having fully expected her to die much earlier, what with her being the sickly, frail baby she had been.

Still, she had survived well enough until her sixteenth birthday, when a passing Baron had taken note of the budding beauty's flaxen hair and stunning smile. The Baron Archeim, who ruled a small barony nearby, had requested Lyra's parents to give her to him, and they had happily obliged, eager to give their young daughter a taste of life far above their station. Lyra herself had been ecstatic, and had trouble sleeping the week before the departure, so great was her excitement.

How was she to have known that on the first night of her stay at the Archeim mansion, she would be brutally beaten and raped? That Baron Archeim had a sadistic streak and a penchant for young girls?

She tried to escape, of course, but she gave up after the first two attempts, in which she was caught by the guards and beaten to an inch of her life by the Baron. This prompted her to search for alternative methods of escape- namely, killing the Baron. She had never once considered murder before, but she could see no other way to be free.

But how was a poor farm girl to know where a man bled the most, of which plants killed and which merely caused excessive diarrhea?

So, whenever she could slip away and not be missed, she began visiting the mansion's library. The Baron was not an avid reader by any standards- he kept his bookshelves stocked as a testament to his vast wealth, occasionally adding to his collection whenever he found some rare foreign text being sold at an auction. Lyra taught herself to read from the more easily worded texts, and once she learned enough to read decently she became enamored with novels- tales of daring adventures, so far removed from her own life as a glorified sex slave to a noble.

Her seventeenth birthday rolled around, and she began to become used to the nightly beatings and sexual abuse. She never wrote of her terrible treatment to her parents- they already had enough on their minds, and she didn't want to burden them. Besides, what could they do against a Baron? They were mere commoners, and poor, too.

One day, she came across an unmarked, unlabeled tome. One written in an indecipherable language, but was accompanied by helpful, detailed illustrations of strange, arcane shapes- circles with inscriptions, upside-down five-pointed stars, and goat skulls. Many, many goat skulls. Lyra was instantly reminded of the village superstitions of the kuhka, a monster with the head of a goat that would come to steal babies in the dead of night. Her grip on the tome had tightened, then, along with her resolve. If relying on evil creatures was what she had to stoop to, then so be it.

She began working on the preparations for the last ritual in the book, which had the most intricate circle yet. She gathered the needed ingredients from wherever she could- goats' blood from the kitchen, tallow candles from untended candlesticks, and so on.

Drawing the circle was one of the hardest parts of the entire endeavor. She tried her best to follow the drawing's instructions meticulously, but a finger was not the best implement to draw with, nor was blood the best paint, nor was wooden floor the best canvas. But still, she persevered, and completed the preparations.

Here, then, was a problem- she had no idea whether she was supposed to recite an incantation of some sort, like the witches in tales, and even if there was an incantation she wouldn't know it, as she couldn't read the book. However, she was already too far along in the whole mess to back out.

Lyra sat down in the middle of the circle drawn from goats' blood, candles burning with a flickering light at each point of the star inside it. And she wished. She wished for her selfish, sinful desire for the Baron's death to come true, for the entire household to be punished. A devout follower of the Catholic religion would have condemned her right then and there, and she would have spat in their face and laughed. Praying? She had prayed, and prayed often- but where had God been when she prayed to him to stop the pain? To her, His neglect was what had forced her to resort to a pagan ritual.

After the fervent wish, Lyra drew the small knife she had stolen from the kitchen, and pricked her thumb. She used the blood beading at the cut to write her name in the middle of the circle, and stepped back, waiting for something to happen. The illustrations had not gone into detail about what would happen during the ritual.

Though Lyra did not know it, the ritual was one to invoke the strongest of all devils, Lucifer himself. It was something no sane practitioner of the dark arts would try, and even the strongest mages would only proceed with the ritual after preparing magical countermeasures to stop Lucifer from breaking out and wreaking havoc, along with a sacrifice to appease Lucifer's ire at the forced summoning. In normal conditions, Lyra couldn't have even hoped to summon him. However, at that exact moment, Lucifer was wounded. Wounded, and on the brink of death.

So when a naked, red-skinned man covered in wounds from head to toe with a hole through his chest appeared in a burst of flame, she reacted in a quite natural way- she screamed her head off.

Lucifer took a step forward, towards the hysterical female human who had summoned him. She fell backwards, crawling until her back met the wall. Lucifer growled- the contract needed to be established quickly, for he only had moments to live. A quick scan of the room revealed no sacrifice or payment for his services. That was fine. After all, the only thing he needed from her was a replacement body.

"One wish." He snarled. "I will grant one wish."

She stared at him, that one sentence having stopped her screams entirely.

"Any wish?" She asked incredulously.

"Any wish," he nodded, "in exchange for your body."

She gulped at that, and Lucifer berated himself for phrasing it that way- if the summoner was not willing to make a contract, he was as good as dead. Surprisingly, a steely glint came into her eyes, and she nodded hesitantly.

"Very well. What is your wish?"

"Kill everyone in this mansion and burn it to the ground. That is my wish."

Lucifer stared for a moment, then chuckled. It seemed the girl had more backbone than he gave her credit for.

"I shall do so, summoner. But first, I shall take my payment."

Lucifer reached out and grasped her head in his hand, placing his palm on her forehead. And then he concentrated, forcing his demonic energy into her. He encountered resistance- naturally, since a human vessel was never meant to house demonic energy in the first place. She gasped as the alien energy filled her to the brim, then began screaming anew, this time in agony, as more power than her frail human body could handle was pumped into her.

Then came Lucifer's soul, creeping, insidious, its presence so utterly wrong and inhuman, yet unable to be rejected. As it began subsuming her own soul, she desperately clung to the last vestiges of her humanity, until no traces of Lyra remained.

Lucifer stood and examined his new body, his old one crumbling to ashes in front of him. During the takeover, the demonic energy had turned the girl's formerly sky-blue eyes a bloody red, while her blond hair had turned white, most likely a form of rapid aging brought on from the forced soul transplant. Above her heart was a black tattoo of the words 'Lucifer, the Morning Star, Great Satan of Hell' written in ancient Hebrew in a spiraling, circular design. The words slowly faded into her skin, leaving behind the barest discoloration, only visible under intense scrutiny and a bright light.

The door burst open, and Baron Archeim came into the room, accompanied by two guards. Lucifer grinned; he- no, she- had gone through Lyra's memories when she had consumed her soul. She would have fun exacting the revenge she had wanted.

"What is the meaning of thi-"

The Baron never got to complete his sentence, as his upper torso simply vanished, wiped out of existence by Lucifer's Power of Destruction. The top and bottom halves of the Baron's body fell to the floor with wet squelching noises as all the blood in the body was expelled, along with other bodily fluids and feces.

The guards stood there in shock, halberds clattering to the ground from limp hands. they were sitting ducks for Lucifer, who used them to fine-tune the amount of power she could use in this new body of hers.

The rest of the manor was wiped out in a similar fashion, and Lucifer calmly walked out of the front gate as a fire in the dining hall grew and burned down the entire mansion, sending a giant plume of smoke into the sky. Now, all she had left to do was to go into hiding, before those pesky angels find her.

Lo and behold, ten holy presences manifested in a circle around her. They were angels- Seraphs, to be precise. Her brothers and sisters, whom she had forsaken as she was cast down into Hell. Snarling, she readied her Power once more, but Michael- of course it had to be him, the most perfect of the entire lot, shoved an open, empty book at her, from which seven glowing, ethereal chains issued to bind her.

"No!" She howled. "I will not be captured by the likes of you!"

But her struggle was for naught, as the chains slowly but surely drew her into the book, which slammed shut afterwards.

Uriel stepped forward, staring at the book in Michael's hands.

"Surely it would have not been too hard to kill him instead of merely sealing him?" Asked Uriel.

"The soul may be that of a devil, but the body is that of a human. We, as angels, are beholden to never harm God's creations." Michael replied. In truth, he had a second reason- evil as he was, Lucifer was still his brother, er, sister. "That's what the exorcists of the Church do."

"Still, to waste one of Father's artifacts on him... And it was one of his last, too." The last part was muttered reverently as Uriel ran a finger down the spine of the book. "The Grimoire of Sealing, designed specifically to act as a prison for Lucifer."

Their job done, the angels disappeared one by one in flashes of light, leaving behind a burning mansion and the shouts of the townspeople who had noticed the fire.

The Grimoire was kept in Heaven for a while, until it was stolen by an angel as he fell, and given to a certain Vlad Tepes, who used the book to commit unspeakable acts of murder. The book was then lost with his death, and occasionally re-emerged, in the hands of history's most famous villains. It was even mentioned in literature, and served as the basis for the fictional tome 'the Necronomicon' mentioned in H. P. Lovecraft's works. It was eventually retrieved in 1909 with the death of Leopold II of Belgium, and the angels spent decades debating whether or not to destroy the book forever, until Adolf Hitler's appearance in the Second World War showed the angels that humans were just as capable of terrible evil even without the help of Lucifer's knowledge contained within the pages of the Grimoire.

At the end of the war, only the Japanese resisted stiffly, as did the Youkai and Shinto factions. When not even the first atom bomb, detonated in Hiroshima (with the angels' consent) was enough to dissuade them, the angels, devils and fallen angels came together and agreed to allow Lucifer to use her power, albeit with heavy restrictions from the Grimoire. This was the straw that broke the camel's back, as the Japanese collectively lost all faith, the Shinto and Youkai especially, as they saw the form of the Devil capering amongst the flames of Nagasaki.

The terrifying efficacy of Lucifer caused the angels to reconsider, and they collectively agreed to use the Grimoire as a tool, a tool to harness Lucifer's devilish powers without running the risk of her acting out of line. This exploited one of the loopholes of existing as an angel- there were no laws prohibiting them from using a proxy to kill.

This is what led to Lucifer's awakening in an empty apartment, with a sheaf of papers clutched in her hands detailing her mission.

"You are to watch over Rias Gremory, and evaluate whether she is a threat to the balance between the three factions..."

I haven't decided on a pairing for Lucifer, so tell me what you guys want. (I have no idea how to do a poll)

Choose one out of the following (ONLY ONE.):

1. Sirzechs (and by extension, Grayfia)

2. Rias (yay yuri! Lucifer doesn't give a single fuck whether her lover's a guy or a gal.)

3. Kiba (why the fuck not. I don't like Issei, and he's gonna get a harem anyway, so I thought the other male member of the Occult Club could be a choice.)

4. Koneko (obvious)

5. Kuroka (obvious)

6. Riser

7. Ophis

8. Azazel

9. Sona

10. Serafall

11. Akeno