Summary-Chelsea (female Harry Potter) to her horror once she woke up after defeating Voldemort, finds herself chained up in a place she never thought she would ever be trapped in. Feeling terrified, betrayed, and angry beyond belief, especially after she over hears just what is being planned for her, Chelsea calls on the very magic around her for help. And help her it does, she just never thought it would send her to another world altogether as it does so.

Disclaimer- I do not own One Piece or Harry Potter in anyway, nor do I make any profit off of either one of them.

CHAPTER ONE-The fight

Chelsea watched with a completely feral smile on her face as the daggers she had just thrown slid right at home in yet another death eater throat; killing him in mere seconds as he choked on both his own blood and her blade. Ending his life without any mercy before he could do the same, if not worse, to someone Chelsea actually cared about.

Seeing this Chelsea let out a small but completely delighted sounding laugh and continued fighting; resisting the urge to sing little death eater down so few more to go as she did so. Terrifying all the death eater around her and causing the few members of the Order of the Phoenix to look as her like she was completely insane, as she did so; just as she had planned it. After all she was playing up her Black family blood to get the reactions she wanted from everyone.

Chelsea seeing this looks being directed gave a slight smirk before she used the fact that everyone else was distracted by the way she was acting to her advantage. As she grabbed yet another one of her daggers before she began to attack the stunned deatheaters around her; beginning her deadly dace of death anew. Moving so quickly and graceful as she did so she almost looked like a goddess of war as she dealt out death to any one who dared opposed her on the battle field.

The death eaters seeing this and seeing that she, unlike the majority on her side, didn't have a problem in the least bit about killing them began to shift away from her; not wanting to get in her way as she fought. Caught between being terrified of the dancing death in front of them and the punishment they would suffer by their lord's hands if he found out they tried to run away from Chelsea in the first place.

Leaving most of the death eaters trapped between a rock and a hard place as they attempted to turn their attention to the others in battle hoping that it would mean that they were out of the way of the Potter girl's way; as well as having an out from their lord if anything happened.

As if realizing this Chelsea gave another bone chilling grin and threw herself at the conflicted death eaters; determined not to let them get away like they seemed to want to. Determined not to give them the chance to attack those she cared about or even flee like some of them seemed to want to do; despite the fact they would be punished for doing so. She wasn't planning on showing any mercy to those that didn't show mercy to others in return.

After all, it had been deatheaters that had killed the girl she had thought of as a little sister. Of course, they couldn't give her little sister a clean death. No, knowing how close Luna had been to her, knowing how much Chelsea cared for her, they had tortured her to death; making her last moments as agonizing as they possible could. Then to rub salt on the injury they had even sent Chelsea her dead torn apart body as prove of what they did.

It had been an attempt to break Chelsea in some way, and it had worked in a way that the deatheaters would regret even in death. Because instead of making her lose all will to fight like they had been hoping it made a very cold, icy, fire of vengeance burned in her heart instead.

So, Chelsea had little to no sympathy for them as she attacked and hell of a lot more rage and bloodlust directed at them more than anything. But as she saw it at least she was putting those emotions to good use as she took out what most would consider nothing more than rabid animals.

Which was why, despite the fact the so called light side was look at her with disgust as she used one of her daggers to take down another deatheaters, who had been aiming at the back of one of said order members, Chelsea continued her rampage on the death eaters; determined to get to Voldemort and end that bastard's life once and for all.

It took her a good hour, and cost Voldemort a good chunk of his death eaters, but Chelsea eventually made her way to Voldemort. After the deatheaters finally learned to clear a path for her and get the hell out of dodge when she was in their general area.

Now she was standing in front of him, covered in the blood of his death eaters and wearing a down right terrifying grin on her face. As she had her wand out in one hand and a long blood-soaked dagger in the other; both pointed directly at him. Voldemort seeing this and taking in her blood-soaked appearance with a smirk, silkily hissed out to the enraged girl in front of him.

"Oh, little Potter I see you had a little fun with my death eaters before you came here." Here he paused and gave the girl in front of him a rather sickening grin before continuing on.

"Tell me did you enjoy making them scream? Did you enjoy making them bleed for you? Because I sure now me and my men did when we killed that worthless Luna girl you called a sister. Did you know she begged for you to come save her? In fact, your name was the last thing she cried out before I personal killed her. Though you don't need to worry about that seeing as you are about to join her anyway. Maybe when you meet up in death's domain you can beg her forgiveness there."

Hearing the Chelsea became completely infuriated and could swear all she was seeing was red; how dare that monster tease her about her little sister's death. At that moment, more than she ever wanted before, Chelsea wanted Voldemort dead on the ground at her feet; preferable after he had died a long, slow and pain filled death.

This raged seemed to be exactly what Voldemort was looking for, what he had been aiming for when he had brought up Luna's death for that matter, because all he did was smirk in triumph as Chelsea began the glare pure death at him. Hell, he almost seemed to grin slightly as she started throw deadly curse, after deadly curse at him.

Voldemort let this go on for a good ten minutes, secretly impressed with the wide verity of very painful spells that the witch in front of him knew while he did so; some of which he hadn't learned about until he had years after he had left Hogwarts. So, the fact she already knew them, and could use them so well, surprised him a bit.

But getting over that fact, and over the slight jealously he was feeling because of this, Voldemort decided to take matters into his own hands. He waited for the moment he knew was coming soon, when Chelsea has to stop for a breath, and sent a curse at the slightly panting girl.

A spell that had caused said girl's eyes to widen slightly in fright as she saw it heading straight toward her with no chance to dodge. At the same time, she couldn't help but curse herself slightly for letting her rage control her as much as it just had, because otherwise she wouldn't be in the situation she currently was in.

"Avada Kedavra! " Only for Voldemort's eyes to widen in disbelieve, and a bit of fear, as the spell only seemed to be absorbed in to Chelsea instead of killing her; seemingly having no effect on her what so ever. In fact, if anything it seemed like her magic actually enjoyed the Killing curse as briefly flared what could be taken as happiness as it absorbed the curse in question.

Chelsea after being hit with this curse and realizing just how close to death she had just been, because she had let her emotions get the best of her, immediately felt an icy calm wash over her; her rage had nearly cost her, her life and she didn't want that to happen again. Hell, if her magic hadn't decided that it actually liked the killing curse enough to absorb it of all things then she would have been dead by Voldemort's wand already.

It was because of this icy calmness that Chelsea realized that the Dark lord was still slightly stunned at what had just happened. Everyone seemed to be stunned what had just happened for that matter, if the pure eerie silence that had overcome the before then loud battle field meant anything.

Seeing this Chelsea gave slight smirk as she decided to take advantage of this fact and threw a curse at said stunned dark lord. Hitting him directly in the chest and causing a large bloody gash to appear where the curse hit.

She had thrown a spell of her own creation at the dark lord, mainly because she didn't want to risk the same thing that had happened to her to happen to the dark lord if she did throw the killing curse at him, and her spell had actually worked even better than she had thought it would. Not to mention her spell was a lot more interesting, as well as painful, then the killing curse would have been anyway.

The curse once it hit Voldemort had several different effects, one the most obvious of them all it seriously injured in, two it caused him to be knocked out of his shocked stated and then finally it caused him to grip his wand tighter than he was before. It seemed that now both of them were taking the duel they were in much more serious than they had been before; there was no playing around now, no letting their emotions take control.

What seemed like hours passed as the two continued to trade curses each holding the upper hand for a little bit before, just as it looked like they may win, the one that they were fighting started to best them. It was a viscous pattern that looked like there wouldn't be an end to unless the both suddenly dropped dead as one.

That is until the wound on the dark lord's chest started to affect the way he was dueling. Until the spell Chelsea had hit Voldemort with began to take the effect Chelsea had wanted when she first created the spell. Seeing as it was a cutting spell that was designed to not let the blood clot or let it be healed until the counter curse she had made for it was cast upon it.

Usually the spell made just a small cut, more often the not in a place most people wouldn't think to check for injuries, where the victim would slowly bleed out; most likely unnoticeably especially in the middle of a battle. But, at the same time, she had thrown quite a bit of power behind it when she had cast it; leaving it with the same effects on a much bigger, much more notable cut. Yes, it was considered a dark spell but as it was showing right now, it was incredible helpful in a battle; if one had the skills or patients to wait for it to take effect.

Seeing as up until then Voldemort had been able to ignore the pain said wound was causing him but after so long of fighting the blood loss from the wound was really starting to get to him; even if he felt his magic should have dealt with that problem long before then.

Mainly by causing him to slow down and for his movement to because a lot more clumsy then it usually was. Seeing this Chelsea once again took advantage of the weakness presented to her and shot one of the most lethal curse she could think of at Voldemort; a curse she knew, if it hit, would destroy Voldemort once and forever.

"Fiendfyre!" She then watched as a Hydra made of pure, but completely deadly, flames began to make its way to Voldemort; at both blurring and amazing speeds. Chelsea then watched with glee as Voldemort was unable to get out of the way of the spell, to exhausted from both the dueling and the blood loss he was suffering from to do so, and because of this was quickly consumed by the giant fiery Hydra she had sent his way. Ending one of the most dreaded dark lords rein once and for all; seeing as the Fiendfyre unlike other flames was said to go soul deep.

Seeing this Chelsea felt a large smile stretch across her face. A smile that swiftly turned into a look of intense concentration as she directed the wild, nearly uncontrollable Hydra toward the remaining death eaters around her; all who were gapping at the black brunt spot where Voldemort once stood. After all the spells was still in effect and why not take advantage of that was well as everyone else disbelieve to end the war they where in just that much faster?

Once they were all incinerated Chelsea used every ounce of concentration and magic she could spare, from her nearly exhausted core, before beginning to smoother the fiery hydra in front of her; not giving it any chance to run ramped and destroy those who fought beside her. Like the fire was known for doing when the caster lost control over it.

After doing this Chelsea began to stumble as the exhaustion form all the fighting, as well as the magic she had done, began to overtake her and just as she fell into unconsciousness she saw the face of her two best friends; Ron and Hermione staring down at her. Rather odd looks on their faces as they did this; not that Chelsea really noticed this as she finally lost her battle with exhaustion.