A/N: If you know about my black blood Headcanon then you can skip the info on what they are.
A/N2:
This was one of my first fics with this concept but since I never finished it I sort of forgot about it, maybe if I post it I will find the strength to finish it XD

Once upon a time there had been two kind of vampires.

The sparkling poisonous ones and the ones that inspired humans' legends about their kind.

These vampires were called "black bloods" and were the first reanimated corpses to walk the earth. Their origin was unknown and their bodies were composed of two things; blood and venom. Their blood had a black color and an intense acidic scent which was what gave them their name and characteristic acidic scent.

That rotten blood in their tissues needed to be stimulated with doses of venom from time to time in order for them to survive. Before the poisonous vampires came to be black bloods survived by feeding off each other.

Too little venom weakened them and too much venom could poison both their bodies and minds. Poisoned vampires couldn't control themselves and would end up bringing death upon themselves due their survival instincts shutting down.

With time some of them began evolving and losing aspects that threatened their survival. Adapting.

While the first ones were stronger and had their senses and bloodlust more heightened than their sparkling counterparts their nature still made them also weaker.

They had black blood coursing through their veins forever lingering in their tissues making them as strong and fast as the worst newborns.

Their eyes turned silver when they fed on venom but would become completely black, even their sclera, when the venom in their bodies started to die down. Black veins marred some of their skin as a sign of the rotten blood coursing through their bodies.

Unlike the poisonous ones these were unable to turn humans with their bites. The venom in their bodies being too weak to be able to affect humans or even other vampires. Instead, in order to turn humans they would drink their blood until they were left at the brink of death and then proceed to feed them their rotten blood.

Some refered to them as "the cannibals" due the fact that they not only fed off other vampires but they also fed off each other's blood.

These vampires also held the abilities of flight, scale walls, shapeshifting and hypnosis on their side, separating them even more from their counterparts who lost these abilities as nothing but venom began coursing through their bodies.

Black bloods as humans claimed in their legends wielded retractable fangs and claws that could pierce a vampire's skin without troubles. Could transform into horrid humanoid creatures with bat wings and bat-like features. Would sleep when the sun was out and wake past sunset.

But while these abilities could put them over the others their weaknesses gave them a great disadvantage that put them below their counterparts instead.

Their skin burnt under direct sunlight and their resistance to light in general was little to non-existent which did great at making them nocturnal creatures as a result.

Vervain was poisonous for them the same as silver and holy water could burn them. Religious chants, crosses and garlic could also harm and repel them. A stake to the heart would turn them to dust. Couldn't step on consecrated ground and needed to be invited in order to enter houses.

With time the poisonous ones became the dominant specie as the black bloods began meeting their demise either under the hands of hunters or the Volturi themselves. Their never-ending thirst for blood made them become aggressive with time. Irrational. Feral.

And as their need for venom also increased they began slaughtering entire covens.

Thus the Volturi saw them as too much of a threat to their specie and decided to exterminate them.

Some claim that the real reason behind their extermination was decided due the discoveries of them being able to infect other vampires and humans alike with their blood. Others that the Volturi got rid of them due the fact that they couldn't be tamed and less much controlled.

The last black blood to be reported was the South's terror who rose around 1864.

The God Of War.

Best known as The Major.

He had been the most feared and ruthless individual in the vampire world, the most lethal of their species. He had been a dangerous and feral vampire who had never, not even once, lost a fight; he trained and led armies of newborns that he slaughtered himself when he saw it fit. He fought in the Southern Wars for territory, slaughtering thousands of humans and vampires alike in his wake. He was well known for his strange ability to subdue an entire army without lifting a finger.

The death and destruction that he had caused in his wake was still, to this day, one of the worst things to ever be recorded in vampire history. And while the Volturi had tried to put an end to those wars and him, The Major was known for having annihilated one of Aro's armies. On his own. Having come close to slaughtering Aro himself.

Some vampires referred to him as "the God Of War" due his terrifying presence in the battlefield, his control over newborns, and his perfect record of victories. He was a monstrous being who existed to leave nothing but death and destruction behind him. His bloodlust bled over the battlefield like a cloak of nightmares that sent armies scattering in terror.

He was the personification of what an actual vampire was meant to be and so much worse. He was the one thing all vampires wished to never come across in their lives.

The Volturi never managed to take him down but that didn't matter for around 1905 he stopped appearing around the South which with time and due lack of sightings the vampire world got some peace as he was reported dead.

He was meant to be dead.

So how did the Cullens didn't notice he was living under their noses until it was too late?

And on top of that.

How is it that that demon turned out to be their most peaceful member?

~~~~~~~~~~~~

When Alice and Jasper first arrived Jasper had plead beforehand to Alice to not tell the Cullens about his true nature nor his past in general and she had abide by his request, that maybe it was a good idea for him to start with a clean slate.

So nothing but a portion of his life in the South was given. Vague and without details.

He camouflaged his scent using the same products Alice used. Yes. Even her perfume. He showered a lot too to the point where both of them knew it was hard if not impossible for the Cullens to tell him apart from Alice when it came to their scents.

And while Alice knew it was wrong to lie to their family she had grown to not care for her mate's safety was more important.

Plus. As far as things went nothing had ever gone wrong. She and Jasper took great care of things so no one would ever suspect a thing. So nothing could ever happen.

Decades with the Cullens and so far the one incident that almost blew their cover up was when he tried to kill Bella due the paper cut. She had given him chase after he had fred himself from Emmett's hold. At the time he had been too overwhelmed to keep a grip on himself and his shapeshifting had gotten as out of control as she knew he had felt at the moment.

Edward had almost seen him.

But Alice had managed to see it before it happened.

Aside from that things had been kept under wraps.

It was easier to let others think he was still having troubles with the vegetarian diet and being around humans in general after decades of being put to test than telling the truth.

No one ever suspected a thing.

But of course all lies crumbled down sooner or later.

And theirs was long overdue.Ever since the near fight with the Volturi the line between territories had disappeared. Sort of. The Quileute had granted access to the Cullens and the Cullens alone to be able to step into their land without the threat of being attacked for it.

Renesmee for the most part had to do with it along with the fact that both sides were attempting to strenghten their alliance. Trusting each other into their territories being a good way of doing it.

Jasper of course took this as his chance to explore the wolves' land in case a future rupture was to happen between them. Alice said he was too paranoid. He liked to call it being preventive.

He hunted on his way back, but as he was nearing the river a familiar scent caught his attention. Freezing him on the spot.

Blood .

Human . Blood .

But unlike the ones he had ever smelt this one felt like a wave of lava that slammed right down his throat and blazed like the sun itself. It was the sweetest and the most wonderful smell he had ever smelt in his entire life.

It strangled him and before he could stop himself his legs moved towards the direction. The scent screamed for him. Sang like the lullabies from Heaven itself and it didn't took him long to find the source. A woman laid on the ground with her forehead bleeding. If her state along with the trail above was something to go for she must had slipped.

The wind blew towards him bringing the sweetness of Heaven with it and he felt himself near suffocate with the intoxicating scent.

He was crouching at her side in less than a second. His hand hovering over the cut on her forehead for a moment as he felt himself shaking. He couldn't stop himself from touching it. The warmness of her skin and the dampness of her blood sent a shiver down his spine and as he looked down at his bloodied fingers there was no hope for him.

He licked the blood.

And that was his demise.

The sheer sweetness of it snapped his rational side to shreds and he grabbed her hair. Yanking on it to reveal her throat to him and he dove down.

But he didn't got to bite her.

A force collided with him. Huge and wrathful. Wolf . He crashed against a tree but got back up in less than a second. Snarling at it and dodging its fangs as he lunged back for the woman. Her blood screaming for him. His throat threatening to melt down under the sheer heat of his thirst.

But once again he was brought down.

And he didn't waste a second to start struggling and growling. Snarling and taking a swing at the legs that walked past him and towards what was his . A weight on his back forced him to be flat on his stomach and he felt his instincts scream even more in righteous wrath. Claws digging onto the ground as he tried to escape the hold without avail.

Then a guttural sound tore out of his throat as the sweetness was taken. Taken . Far. Far. It was escaping. Escaping . And that was all the incentive he needed in order to shift into a crow. Using the small size and wings to escape the wolf before shifting back into his human form and lunging for the bastard who wanted to take what was his.

More wolves blocked his path and he snarled at them shifting into a wolf himself and manipulating the size to match theirs before lunging at one of them. Sinking his fangs into its back and twisting the bite in order to break as much flesh as possible. Yelping echoed in his ears as the wolf tried to free itself from his hold. Another wolf bit down on him forcing him to release his victim.

He was thrown on the ground and as he rolled back up he shifted into a small fox and ran right between a wolf's legs. Something clamped down on him with unforgiving force and pain explode across his ribcage. Acid filling his senses as his form melted back into his human one. He crashed on the ground with a choked gasp. Arms wrapping around his mid as he fought and failed to make sense of his surroundings.

Because he could still smell her. The singer from Heaven. And it was getting further and further and now he couldn't move. Pain blaring with each breath he took. He tried to drag himself towards it but a weight on his back stopped him. Sending even more pain across his existence.

He wasn't sure how long he spent there panting and fighting to get his mind back on track but by the time he did he was in Hell. Face pressed against the dirt and muscles spasming. He felt nauseous and there was pain all over his ribcage. His throat burnt to the point where he couldn't even dream of speaking.

And the stench of acid.

That finished bringing him back to the real world as panic seized him and he tried to get up. Because he was bleeding and that was so not good.

But the white pain that explode across his ribcage along with the weight on his back that forced him back down almost made him scream.

Still.

All he did was bite his tongue and curse the whimper that left him as he dropped back on the ground. Panting. The stench of dog let him know what was holding him down.

It took him a moment to process his surroundings and the situation he was in.

The second he did the second he felt his long dead heart sink.

Shit.

He had almost killed a human in their land.

And he attacked them.

He took notice of the other wolf. Paul if he remembered correctly.

And as he looked up he was met with Embry.

Both of them were bleeding anger. Disgust. Mistrust. Yes.

But the dominant emotions were confusion. Wariness.

And if he focused hard enough there were flickers of fear.

Jasper tensed when he heard footsteps and then Sam came into view. His emotions were a hurricane of rage and disgust. Mistrust. And something else he couldn't quite pin point.

-Sam, I'm sorry. I didn't mean to-

-Quiet.- Sam's voice was harsh and commanding and while part of him raged at the order his rational side told him to not anger him further. He messed up big time here and with some luck he hadn't ended up fucking up their alliance.

Carlisle would kill him if that was the case.

-Embry. Release him.- The Alpha ordered and as the weight on his back disappeared Jasper was quick to get up ignoring the flaring pain as he did. Sam snatched his arm in a tight grip and pulled him. He stumbled, definitely not expecting that, and while his first instinct was to bite at the fact that a mutt was touching him he held back.

He shouldn't mess things up more than he already did.

Thus he let Sam drag him back to the Cullens. Paul and Embry right behind them oozing danger as they walked.

The walk was silent and Jasper could feel himself growing less and less good at not stumbling as dizziness began taking hold of him. A pounding in his head matching the torture of his ribcage.

And fuck he is still bleeding. Bleeding . Fuck. Shit. The Cullens would know. The Cullens. Would know. He was absolutely fucked.

Of all possible forms his secret could come out this was without a doubt the worst. And now...

Now the Cullens would see it. Would see how it was a mistake all along to have him around. To allow him here when all he ever did was fuck up. That's all he was good for. He fucked up. He was a monster. A demon who shouldn't be alive. All would make sense to them now.

Before, their hopes for him to get better had been the reason he was allowed to live there. It wasn't said out loud but he wasn't stupid. He knew that was the reason. No one in their right mind would risk their coven with someone as problematic as him if he couldn't be fixed.

But now... Now Carlisle would realize he couldn't be fixed. He would never get better because that just wasn't possible. This was the best he could do. Not more. He would never be able to stand the scent of human blood the same as he would never be able to look as nothing but a pained robot at school. Inhuman .

He would never be as good as them. He couldn't be fixed because there was nothing to be fixed. This was him doing his best.

And now he would lose it all. And Alice... His beautiful Alice would get so upset. It would break her to see the Cullens giving their backs to him.

She would follow him.

That sudden realization made him halt. He ignored the growls behind him and Sam's warning look. Nothing mattered right now. Because Alice would throw it all away.

She would follow after him. He knew she would. That's how she was. It would shatter her to leave the Cullens but she would go with him. He didn't want that. He didn't want to take her back to a nomadic life. Her happiness was here. With them .

And so taking advantage of the wolves to hide him from her visions he broke from Sam's hold and made a run for it in the opposite direction. Not towards the wolves' territory but certainly not towards the Cullens.

He ignored the pain and dizziness in order to force himself to run as fast as possible. Faster than a wolf could ever dream of running. He shifted even if that made white pain explode deep within his ribcage.

A crow.

Using wings when his ribs were broken wasn't a good idea but flying would certainly allow him to escape.

And he was still bleeding God.

He needed venom.

But he couldn't go back to Alice.

Even if the wolves told the Cullens he would be long gone for Alice to be able to follow him.

Long gone for her to decide to throw her life away for him.

He wasn't worth it.

She would be happier and safer here.

He was never meant to find happines nor peace anyways.