Hey guys! This is my first story so please be gentle and try not to flame both it and me into oblivion too hard.

I was inspired by the works of Emiyn and I kind of ripped off his introduction sections and the general scenario of Ben being stuck in the Null Void for two years after the ending of Season 2 Episode 13 of the original Ben 10 series before Ben is sent to another world that isn't his because of Phil screwing things up for him. But don't worry, that is the only thing of his I plan on ripping off (and if Emiyn is in fact reading this, sorry for ripping off your general scenario, it's just really good). Plus, you know what they say: imitation is the sincerest form of flattery.

Unless you completely copy someone else's work and claim that it is your own. Then that's being an asshole. But enough of that.

Anyways, if you guys are confused by the first chapter, just read the first chapter of The Null Fairy by Emiyn and that's pretty much everything that leads up to Ben being stuck in the Null Void for two years (damn, I am unoriginal).

So, why a crossover with High School DxD? Well, aside from there being only two Ben 10/High School DxD crossovers that I consider good (those being Ben 10: Dragon God of Life by DragneelGiant96 and Ben 10: Game of Life by mak89), I thought that making a Ben 10 & High School DxD crossover would make for both an interesting and fun first story.

One more thing that I should mention is that, like Emiyn does with the Bens in his stories, I am going to give the Ben in my story his own distinctive personality that is different than the canon Ben from the original series.

This Ben is a good deal more lazy and sarcastic than canon Ben. He has a weakness for sweets and salty things since he hasn't had any in two years (so he's kind of like Koneko in that way, minus being a cat person). While generally unmotivated to do things, he can be hardworking if he believes that his work will pay off. This version of Ben also curses a little bit because he has been in the Null Void for two years without anyone to tell not to do so. Whenever somebody calls him out on this, he gets defensive and says things like "I'm entitled to since I had to fight off Vilgax and Kevin before becoming stuck in the Null Void" or something similar to that.

Anyways, enjoy the story.

In the long run of things, people make up the masses of faceless, nameless bystanders that are ever so present throughout humanity's history. Usually a person's life, no matter how long or influential, will always be a mere footnote at best compared to the vast amount of events that make up Earth's history. And Earth itself is insignificant in the scale of the galaxy, which is in turn nothing compared to the infinite expanses of the universe.

However, there are exceptions to this rule. There are those whose names become etched into the history of their worlds and sometimes even the worlds beyond for centuries, millennia, even eons. Few ever reach this level of relevance and those that do gain that relevance through either great valor, evil or power.

The names of these people are known by the masses of all ages, either loved or hated: Heracles, Jesus Christ, Mahatma Gandhi and Adolf Hitler are but a few of the many people who have made their mark. However, one thing that the masses forget is that these people didn't just pop out of nowhere being 'good' or 'evil'. They were born, had childhoods, were influenced by outside factors and had to make choices. These people didn't start out relevant. They were once a part of the masses of faceless, nameless bystanders.

Now, another person is gaining this relevancy. That person's name: Benjamin Kirby Tennyson, otherwise known as Ben Ten. He too started out as a part of the masses, on his way to an existence of no interest. However, that all changed the night that he became the wielder of the Omnitrix, an incredible piece of technology that allowed him to transform into any sapient alien species within the Milky Way Galaxy.

From that night on, young Benjamin spent his summer vacation doing work as a traveling superhero. In the short span of his hero career, he had fought the zombies of extinct animals, battled extraterrestrial bounty hunters, saved countless people, defeated over a dozen different villains and even faced off against both an intergalactic warlord and a ghostlike alien trapped inside of the Omnitrix.

For a time, life was good for Ben, his cousin Gwen and his grandfather Max. However, these good times were not to last.

During one particular encounter with the intergalactic warlord Vilgax of Vilgaxia, previously known as Murray, and the misshapen former street thug Kevin Levin resulted in all three of them becoming stranded within a prison dimension known as the Null Void. This was a hostile world full of dangerous creatures and the worst of intergalactic prisoners, where to survive you had to either kill…or be killed.

From then on, Ben had to survive this eerie expanse of violence and malice. He needed to fight, kill and hide to ensure his survival, destroying his innocent past self in the process to better cope with the constant bloodshed he had to subject himself to in order to live. His psyche was shattered before being reforged stronger than before, giving Ben the will needed to carve himself a niche within the hellhole he now called a home. And for two years he would do just that and prove himself a strong and clever survivor.

So it should come to no surprise that he eventually managed to escape the prison space after two years of hard work and determination.

Our story begins there…

...

Dear readers, please allow the author to direct your attention to a very large rock floating through the Null Void. While this dimension was meant to house intergalactic criminals and creatures that for some reason or another couldn't be kept safely back in Ben's home dimension, there were those that didn't fit into one of those two categories: settlers, wrongfully convicted prisoners and people at the wrong place at the wrong time. Our protagonist fit in the last category. And speaking of our protagonist, he's waking up somewhere on the aforementioned rock.

Ben rubbed his eyes as he started to rise up from his makeshift bed that consisted of the skins of various Null Void creatures, namely a pack of Vulpimancers that had made the unfortunate mistake of attacking the Omnitrix wielder on a particularly bad day.

That day had been made better by Ben getting enough new furs to make himself a new bed. May those foolish Vulpimancers rest in peace.

Ben was currently wearing a dull grey shirt that had black lines with olive green pants that had black stripes on the bottom and a pair of black and white sneakers. Due to the Null Void's lack of sunlight, Ben's skin had paled slightly and the lifestyle that had allowed him to survive the dimension had gifted Ben a slim but muscular build, similar to that of a young athlete's. His brown hair had also grown out to the point that his bangs would occasionally get in the way of seeing.

"Today is the day," Ben said to himself excitedly as he sat up and stretched his arms, popping them in the process. After a moment of stretching, Ben rubbed the sleep out of his eyes and stood up. Looking down at the Omnitrix, Ben started scrolling thought all of the silhouettes of the various aliens that he had unlocked, both before and after his accidental imprisonment to the Null Void. Upon finding the alien he wanted, Ben pushed down on the Omnitrix's dial.

A flash of emerald engulfed Ben, transforming him into a red, humanoid ray-like being with yellow horns, green eyes and two lightning bolt-shaped stripes. It also possessed a skinny tail, yellow patagia, gills along it's sides and skinny legs with two toes on the front and one two on the back. The alien's height increased by a good amount from Ben's normal height and the Omnitrix symbol was displayed on it's chest.

"Jetray!" the newly transformed Ben shouted out before flying over the edge of the rock. Upon going over the edge, he started gliding vertically downwards to a small hole that had been carved into the wall near the bottom of the rock through unknown processes.

The hole was under a section of stone that sloped inwards, preventing anyone from climbing down and getting to the hole without the very high risk of falling off and into...well, the void of the Null Void. The only possible way of getting there without that risk was if you could fly, levitate or had sticky appendages that allowed you to cling to rock while hanging upside down.

"Today is the day, today is the day, day is today, today is the day," Jetray kept repeating to himself with an excited smile on his face as he hovered in midair to reach his arm inside. After a bit of moving his arm around in search of whatever was inside, Jetray brought his arm back out with an item in hand. Once he secured his grip on it, Jetray flew back to the top of the rock and landed. Placing down the item he had grabbed, which was a machine about the size of the average Fedex box, another green flash enveloped Ben, transforming him into a new alien.

This alien was a rather minuscule one, being frog-like in nature with grey skin, two large eyes with horizontal eyelids, gills on the side of it's bulbous head and small, sharp teeth. Unlike Jetray who wore no clothing, a black and grey jumpsuit outfitted this transformation.

"Grey Matter!" the hyper intelligent amphibian announced before he started tinkering with the machine in front of him. Grey Matter would continue to work on the machine for several more hours, never noticing the figure watching from an ever-decreasing distance from away behind the large rocks. The figure never made any aggressive move towards Grey Matter and merely watched, waiting. After about six hours of continuous adjustment and modification, the Galvan deemed his work complete and transformed back into Ben in a flash.

"Finally! Two years in this stinking place, freedom at last!" Ben shouted out ecstatically as he pumped his fists in the air out of joy. T completion of this device, which was a dimensional portal generator, had taken almost a year and a half to complete and it was just about to pay off.

"That's great Ben," a male voice said from behind Ben, interrupting his little bout of happiness and causing him to spin on his heel as shock shot through his system. For some reason the voice sounded familiar to him. "For me that is."

Stepping out from the shadows was a familiar but unwelcome face making itself known to the shapeshifter. The owner of the voice was a rather tall man with hair that was starting to turn white from age. His fair skin hinted that he was Caucasian in ethnicity. His black clothing had certainly seen better days, as it was torn, burnt & dirtied in multiple places, and a permanent scowl seemed to have formed on the man's face. His facial hair was starting to grow long, as if he hadn't had a any access to a razor in awhile.

In short, it was pretty obvious that this man hadn't been doing nearly as well as Ben had in terms of surviving the Null Void.

"Oh great, a familiar face," Ben groaned out sarcastically before putting on an obviously fake smile as the man grabbed a pistol from his belt. "How ya doing Bill? Ya staying in shape? Eating healthy? Getting enough sleep?"

"It's Phil!" the now-revealed Phil hissed out in a mixture of annoyance & anger at having his name botched up. He didn't bother answering any of Ben's questions. "And if you don't want to die, I recommend that you step away from the portal generator."

"Uh huh," Ben said as his fake smile vanished, visibly unintimidated by Phil's threat. "And what makes you think you're able to back that threat up?"

"I'm so glad you asked," Phil said with a smile, sadistic glee entering his eyes. "You see, for the past year I've been watching you-"

"Stalker."

"Don't interrupt me! Anyways, for the past year I've been watching you and observing you use all of the alien forms you have. I knew that eventually you would come up with some way to escape this accursed dimension with either your Galvan or Cerebrocrustacean form, so I watched and waited. All the while, I also developed counter strategies to every alien that you've transformed into, even your Vaxasaurian form. I'm pretty confident when I say that I can take you down."

"Uh-hu," Ben said unimpressed and not buying it for a second. "Well, since you're so confident, then I think I can spare one more beatdown for old time's sake before I hit the road and head back to Earth." Ben took a fighting stance with his hand hovering over the Omnitrix. "Whaddaya say Bill? Round two?"

Phil grinned in psychotic glee before he shot at Ben in bloodlust, letting his actions do the talking. Ben quickly slammed down on the dial of the Omnitrix, blinding his assailant with a green flash before it died down. Phil opened his eyes, expecting to see some variety of dead or, at least, injured alien, only to be greeted to the sight of a short, fat, blob-like creature wearing green underwear with no visible injuries. It's eyes were green, his clawed hands were bearlike and the feet were similar to an elephant's. The Omnitrix symbol was located on the front of the creature's underwear and right below it's belly button.

"This guy may be The Worst," the new alien said as the bullet Phil had shot at him bounced off of his elastic, rubbery hide and onto the ground, surprising the assailant, "but even he comes in handy sometimes."

"That form is a new one," Phil muttered to himself annoyed before he started releasing shot upon shot on the Atrocian. Every time Phil fired though, The Worst would just give cries of 'ouch' and 'ow' as bullets bounced or ricocheted off of him. When Phil finally figured out that he was just wasting precious ammo, he placed his gun back into the holster on his belt and pulled a large hunting knife from it's sheath.

"I may not be able to harm you because of that transformation's skin," Phil began as he started running towards Ben, "but your eyes and the inside of your mouth are another story!"

"Probably," The Worst admitted nonchalantly with a shrug. "But that knowledge doesn't mean anything if you never get the chance to find out if it's true or not."

"We'll see about that you damn brat!" Phil exclaimed while running towards Ben, knifepoint rushing towards The Worst's left eye. Just as Phil was just to plunge the blade into Ben's eye, The Worst touched the Omnitrix symbol once more. As Ben transformed once again, Phil was forced to close his eyes.

Gritting his teeth in frustration, the ex-Plumber continued to charge forwards in an attempt to try and end this fight before Ben turned into something stronger; just because he had developed strategies to deal with every alien that he had seen didn't mean that they were easy to pull off.

If you had to potentially try and climb up the back of an angry Vaxasaurian to use a Hephaestan Neuro Grip on it, you'd want to try and end the fight as soon as possible too.

As soon as the flash died down, Phil opened his eyes to see that nothing had been impaled upon his knife. Quickly looking around, he saw nothing resembling any sort of life anywhere. It was as if the Omnitrix bearer had just vanished into thin air. Anger welled up from within Phil as he looked everywhere for Ben, not willing to just leave the Null Void without getting some sort of revenge now.

"TENNYSON!" Phil yelled out in frustration and anger. "STOP HIDING AND FIGHT ME!"

"Who said I'm hiding Bill?" asked a gravelly voice that sounded very close. Phil turned around and looked in every direction wildly to try and find whatever had spoken but didn't find anything. "If anything, you're overlooking me."

"IT'S PHIL, YOU INSUFFERABLE PEST!" the ex-Plumber raged, swinging his knife through the air in unadulterated, unthinking anger. "WHERE ARE YOU TENNYSON?! HAVE YOU TURNED INVISIBLE?"

"Invisible, no," the voice said. "Invincible, yes."

Following that statement, a sharp pinprick of pain shot up from the back of Phil's neck like something minuscule was biting him. Growling in a mix of pain and annoyance, Phil used his knife-free hand to smack the area from which the pain was originating. His effort to crush the perpetrator was rewarded by the pain vanishing almost immediately. Phil smirked, thinking he had crushed his foe, before he felt something tiny move onto his palm and bite, prompting Phil to hold his hand in front of him to identify his attacker.

Standing upon Phil's palm was a tiny, brown flea-like creature with a single purple eye in the center of it's head, six limbs and a large lower jaw that was currently biting onto his palm. A construction worker's helmet sat atop his head and two holes on the top allowed for two antenna to poke out. The Omnitrix logo was on the alien's chest and the lower four limbs acted as legs while the two highest limbs were arms complete with hands. Speaking of which, said arms were currently crossed as the alien gave Phil an infuriating smirk.

'Didn't think that I'd be fighting a flea' the ex-Plumber thought to himself with a gritted teeth before allowing a smirk of his own to cross his face. 'Although it does make crushing him like the bug he is easier.'

"Sup Bill?" Ben asked in a mocking voice as he released Phil's palm from his mouth, uncaring about the current size difference between he and the ex-Plumber. "Is it just me or have you gained weight?" That particular comment wiped the smirk off of Phil's face & made him snarl in anger as glared at the alien that he had curled his fingers around to crush.

"IT'S PHIL YOU DAMN FLEA!"

"Actually, the name is Rockflea in this form," the newly-dubbed Rockflea corrected from within Phil's hand, amused by both how easy it anger the former Plumber and how said Plumber couldn't do anything that could hurt him. "And you do know that you can't crush me so long as I'm this alien, right? In fact, you're helping me more than yourself since you keeping me closer to you is making what I'm about to do next a whole lot easier."

"What?"

Phil didn't have time to further question Rockflea since a green flash erupted from Phil's hand, forcing the man to open it and let go of Rockflea as he was replaced by something much larger. The alien now standing before Phil was taller than him by a good two or three feet. It greatly resembled a mummy that was made seemingly out of organic bandages and possessed glowing green eyes. The Omnitrix symbol was placed upon it's left shoulder like a sort of badge.

"This has been fun, but I think it's about time I Snare-oh up and leave," the mummy alien said in an attempt to pun (while failing horribly). Snare-oh stretched his elastic, bandage-like fingers towards Phil, who started hacking away at them the moment they came into range with his knife in an attempt to remain free from their clutches.

"Why haven't I seen any of these forms before? Did you unlock them just now?" Phil questioned while biting the inside of his right cheek, too focused on trying to stay uncaptured to get angry at the shapeshifter. Much to his chagrin though, whenever he cut off Snare-oh's fingers they would grow back mere seconds afterwards.

"No," Snare-oh replied, now looking around the surrounding area to make sure he and Phil were still alone; the noise of a fight could easily attract the attention of carnivorous creatures or other prisoners of the Null Void. "I just haven't used them over the past year. An indestructible punching bag and a flea can't really help you that much inside of a prison dimension. And as for Snare-oh, I just haven't had much of a reason to use him."

As Ben finished saying that, he managed to wrap one of his fingers around Phil's knife. Taking advantage of the opportunity before him, Snare-oh yanked the weapon out of Phil's grasp, sent it skidding & bouncing across the ground until it stopped several yards away from the fighting duo. Phil's face drained of color at this and he only had a moment to attempt to sprint towards his weapon before he was finally captured by Snare-oh. Said Thep Khufan then tightly bound the ex-Plumber, bound so tightly in fact that he wasn't able to remain standing anymore and fell to the ground like a freshly chopped tree.

"And if you don't need anything, I guess I'll be going now," Snare-oh said smugly as he started walking back towards the portal generator after he finished making sure he and Phil were still alone. "Have fun Bill! Remember to eat your vegetables while I'm gone. And send me a postcard while you're at it!"

"YOU CAN'T DO THIS TENNYSON!" Phil yelled out in anger as he squirmed within his bandages, loosening his arms just enough that they could reach down to his belt and grab his pistol without Snare-oh noticing.

"Ah, are you sad?" Snare-oh taunted over his shoulder as he continued to make his way towards the portal generator. "You want me to go get your mummy for you?"

The entangled man snarled in fury & grit his teeth together so hard that it hurt before he pulled his pistol out and aimed at the portal generator in a desperate attempt to get back at the twelve-year old. "IF I CAN'T LEAVE, THEN I'LL MAKE SURE THAT YOU CAN'T EITHER!"

"What?" Snare-oh asked in confusion. Ben turned around just in time to see Phil fire a shot at the portal generator. His eyes widened when he saw a bullet hole appear in the side of the portal generator and the machine started sparking electricity & small bolts of various energies. Turning around, the Thep Khufan glared at the human, who now sported a triumphant smirk.

"WAY TO GO FUCKTARD, NOW WE'RE BOTH SCREWED!" Snare-oh yelled angrily at Phil. The unexpected cursing from a twelve year old caused Phil to wipe off the smirk on his face in favor a smiling a little and giggling in humor at Ben's cursing.

"You kiss your mother with that mouth?" Phil asked after his small giggling fit. "I'm pretty sure that she wouldn't approve of your language."

"I'VE BEEN STUCK IN A FUCKING PRISON DIMENSION FOR GODDAMN TWO YEARS, I'M ENTITLED TO SPEAK HOWEVER I WANT!"

Phil began to start laughing his ass off at the cursing Omnitrix bearer before he was blinded by a green flash, which replaced Snare-oh with Jetray. The Aerophibian wasted no time in grabbing the still-bound ex-Plumber with his feet and attempting to take off into the air. Of course Phil didn't make it easy, thrashing within the bandages that held him and basically making flight impossible without the risk of immediate crashing.

"Let go!" Phil tried to command the red and yellow flyer. "I'll shoot you if you don't unhand me this moment Tennyson!"

Jetray growled in annoyance. "Do you want get sucked into a black hole? If you don't stop thrashing in five seconds, then so help me, I'll leave you here to deal with the malfunctioning portal generator. I hope you know how to disable or fix it before the black hole starts."

Phil's eyes widened at that before he wisely chose to shut up and ceased his struggling in an effort to preserve his life. Jetray's face turned into a smirk of triumph at the ex-Plumber's newfound compliance. That compliance came just a moment too late though as a swirling vortex appeared behind Jetray and Phil, pulling them both towards it.

Their faces morphed into ones of fear as Jetray tried to enter hyperspace in an attempt to escape the pull of the black hole, but to no avail. Ben tried this several times as they were pulled closer & closer to the black hole before he realized that there was no chance of escape. Just before the two were pulled inside of the black hole, Jetray decided he needed to get one last quip in before his imminent doom.

"WELL, SEE YOU ON THE OTHER SIDE BIIIIIIIIIIILLLLLLLLLLL!"

"IT'S PHIL DAMMMMMMMMMNNNNNNNNNIIIIIIIIITTTTTTTT!"

And with that, the black hole swallowed up the bearer of the Omnitrix & the ex-Plumber, making the Null Void short of two prisoners. When the black hole finally ceased to be half an hour later, the rock that had been the stage for their battle had been sucked through, along with several other floating rocks nearby, which thankfully had no life on them.

The Null Void was now missing one corrupt intergalactic police officer and one shapeshifting hero. One could only wonder what had and would become of them.

Author's Notes

Before I end the chapter here, I am going to answer some questions that I will almost certainly get in the future.

Q1: Will Ben get a familiar?

A: Possibly. I haven't decided yet. In the case that I do give him one, it will not be either Ship or Skurd. Ship doesn't exist yet and Skurd (as much as I want him because of his snarky personality) doesn't have multiversal traveling capabilities. I am open to ideas about what Ben should get as a familiar, but don't make it too powerful (which means no recommending a hydra or Tiamat).

Q2: Will Ben have forms he didn't have in the original series?

A: As a matter of fact, he will. He'll get all of the original continuity aliens, the reboot aliens (even Overflow because I can just explain him away as a case of Cascans convergently evolving with Orishans), the ultimate forms and even some original forms like Ben's Hulex transformation, Rockflea. I won't give him transformations from species Emiyn has already made forms of like Dragonaut the alien dragon, Sludgestrike the Lenopan, Tenten the Sotoraggian and Copysplat the Limax for the sake of not ripping off Emiyn more than I have already with the general plot for this first chapter & a few minor details later.

Q3: Is Issei in this story?

A: Yes. He is still the same lovable pervert that we all know and love. He still has the Boosted Gear, the passionate obsession with breasts, the dream of becoming the harem king and everything else. Just because I'm bringing in one of the most OP characters in all of fiction into the DxD universe doesn't mean I need to make him any more OP by removing Issei and giving him a Longinus. That's just bad writing.

Q4: Will Ben have a harem?

A: Yes, he'll will get one eventually. Eventually. Why? Well, for two reasons. First is that this is a Highschool DxD story. Ben is being placed in a universe where polygamy is an accepted practice and women seem to gravitate towards men with high power. Of course I'm giving the kid a harem. Second reason is because Emiyn hasn't made any stories where Ben has a harem (he mentioned something about an AU where Ben ended up with Wendy, Meredy and Sherria once but eh, details). So I decided to beat him to the finish line in that regard and give Ben a harem.

The following will NOT be in the harem no matter what anyone says or does: Akeno Himejima, Asia Argento, Gabriel, Grayfia Lucifuge, Ingvild Leviathan, Irina Shidou, Jeanne, Kuroka, Raynare, Rias Gremory, Rossweisse, Sona Sitri, Venelana Gremory and Xenovia Quarta.

Update as of 4/25/2019: Originally Koneko was in this list but I removed her due to popular demand by my reviewers & because I thought the pairing was cute. I hope you're happy guys, because I begrudgingly am.

Anyways guys, be sure to leave a comment, either good or bad (if it's bad, please tell me how so so that I know what to avoid in the future). It really motivates me when I see people leave their opinions on my work. Until next time!