Ben 10 belongs to Man of Action Studios and Cartoon Network

Monster Hunter belongs to Capcom

RWBY belongs to Rooster Teeth and Monty Oum

I only own my OC and Ultimate forms

Dedicated to Braedey95 and CorJayNelson

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Opening - Ben 10 Ultimate Alien Theme

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Beacon Academy

When the Bullhead finally lands and the four came out, Jack and Emma stares in awe at the school that resembles a castle with a large tower in the middle with green lights. They recomposed themselves as they quickly catches up to Ozpin, who walking towards the school in a steady pace.

"*Whistles* So I'm guessing this is Beacon?" Emma asks as they caught of with them.

"Yes Neme- I mean Emma." Ozpin corrects himself. "This is the school and here, I am the Headmaster. But first, the both of you are highly required to participate in an initiation. It is the tradition. But do not concern with that as I belief that both of you will pass he initiation with flying colors."

"It's all great and that," Jack spoke next. "But Emma and I would prefer that few people know our 'abilities' and Emma being a human Nemetrix with the same abilities." Jack in a concerned, yet strict tone.

Jack knew, that if word of Emma and his MonTrix ever came out, naturally scientists and the military, would attempt their hands on them and try to replicate them. He would promise that nothing bad would happen to the MonTrix and his Emma-

Jack mentally shook his head at the last part. His Emma? They only just met. Sure, she made him smile and all that, but that doesn't mean they're already a thing. Is it?

"Very well. Mister Andros." Ozpin said, agreeing to Jack's demands. "We'll do everything in our power to keep your abilities a secret to the public and will only be shared with those of people you choose to trust."

"Thank you Professor." Jack said in relief whilst Emma nodded as the four entered the Academy's main building.

3 hours later.....

After Ozpin and Glynda finished giving Jack and Emma their tour around Beacon, they decided to eat something and head for the cafeteria. Jack had a chili burger with a cold softdrink, while Emma had simple vegetable salad. She was hesitant as first, due to the fact, she was originally a weapon and did not know many thing about having a body. But Jack manages to convince her and ate her salad.

After having their bellies full, Jack and Emma decided to head towards Ozpin's office and Jack wants to let them know about his past.

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Headmaster's Office, Beacon Academy

After a very long elevator ride (in which Emma had to shook Jack after he fell asleep), Jack and Emma set foot to Ozpin's office. The room is rather large with several gears and clockworks at work. The back wall holds a singular window which appears to be a functioning clock face. In the front of the window is a single desk with a unique design based off clockwork gears, where Ozpin sat in his chair.

"Nice of you to join us, Mr. Andros and Ms. Emma." Ozpin greets. "So I see you want to tell us of your past, is that right Mr. Andros?"

Jack grimaces, but nods in acceptance. Taking a deep breath before telling his story. "You see, from where I come from, it wasn't advanced compared to your universe or even in the universe where I now live, but instead, it was a universe where sometimes "survival of the fittest" is your only motto. For you had to fight creatures dubbed, "Monsters."

"Monsters?" Ozpin asks, raising an eyebrow.

Jack nods. "Most Monsters, in my universe at least, are supernaturally large creatures. They can resembles overgrown animals, wyverns, or anything out of the ordinary. While I don't everything, they have several classifications. Majority of them are; Flying Wyverns, Bird Wyverns, Brute Wyverns, Fanged Wyverns, Fanged Beasts, Leviathans, and Elder Dragons. Because 95% are mainly predators and have rapidly growing population, Guilds assigned hunters to make sure they keep their populace down to a minimum. Though you have to pass the hunter's exams to become one."

"Amazing." Glynda and Emma couldn't help but awe at what his world is like. Ozpin seems interested. They were similar t the Huntsmen and Huntresses, but to minimize the threat rather than to eliminate the Grimm.

"And that's not even the best part," Jack grins, getting everyone, even Emma's attention. "You see, when you slay or capture a Monster, you don't just get rewards, you can also make their body parts as well and and armors. Armors only have two types; Blademaster and Gunner. While weapons have more than 10+ classifications; Great Sword, Long Sword, Sword and Shield, Dual Blades, Lance, Gunlance, Insect Glaive, Switch Axe, Charge Blade, Hammer, Hunting Horn, Tonfa, Light Bowgun, Medium Bowgun, Heavy Bowgun, and Bow. Each have their own unique abilities and weaknesses."

"However, I should note that not all Monsters can be captured." Jack continues. "Some like Bird Wyverns are too small to for traps to be set off. Or some such as Elder Dragons are far too dangerous to be captured and must be slayed or repelled."

"Care to tell what are these "Elder Dragons"?" Ozpin asks.

Jack mentally sighs for as he decides to drop the bomb. "Elder Dragons, in my universe at least, are considered the strongest creatures you'll ever face as a hunter. They're once considered gods as they are stronger than nearly all Monsters. They are a threat to an entire or multiple ecosystems. They must be slain or repelled at all costs. And whenever I transform into one, I get more aggressive and bloodlust due to the fact they designed for combat."

"They must be very powerful." Emma said.

"Oh they are. I've fought some of them in the past. But it's the White Fatalis you should avoid of them all." Jack warns.

"White Fatalis?" Glynda questions.

"Known as the Ancestral Elder Dragon," Jack explains. "He is considered to be the strongest Elder Dragon, heck even other Elder Dragons refused to fight him."

"How strong is this White Fatalis?" Ozpin's curiosity got the better of him.

"Far, FAR stronger than Xeno'Jiiva, Dalamadur and even his own brothers." Jack said. "He controls lightning rather than fire unlike Fatalis and Crimson Fatalis. His attacks can incinerate hunters dumb enough to get close by. And trust me when I say when me and several hunters fought him, he flew to the moon and created an endless eclipse on Earth and flies back in 7 seconds, making White Fatalis moon-planet level and faster than the speed of light." Everyone's eyes widened in shock at the power of White Fatalis.

"But in the end, we managed to slay it and saved the world. Until that day came." Jack's voice turns sorrow at the last part.

"What happened?" Emma said in concern.

"Khyber. My arch-rival." Jack said, clenching his fists and jaw. "One day, a portal with a weird flying ship appeared above us and invaded. We were literally outgunned by their superior technology. That's when I met him. I lost, badly. And watch as my mother and younger sister die in front of my eyes. Khyber left me for dead and I would've, had my best friend Ben Tennyson, and his grandpa, saved me and took to  their universe as the only survivor of the village." Jack said, a lone tear shedding from his left cheek.

Emma frown and puts a comforting hand on his shoulder for support. Meanwhile, the two teacher look on in shock and sympathy for Jack. Having to lose his family in an invasion by the Khyber person and his village destroyed

"Anyways, after a few years, a small person named Azmuth, who is the smartest person in five galaxies and created Ben's Omnitrix, his version of the MonTrix, came to me and said he had something for me; the MonTrix. He explained to me that he was fascinated by the Monsters and Elder Dragons that resides in my universe and decides to create it for me. He also said despite knowing that the Omnitrixes are not always for combat, the Montrix is an exception and added the Ultimate Evolutionary Function."

"How generous this Azmuth is to give you something that will help in your future." Ozpin smiles, before asking a question. "Though if I may ask, what is this "Ultimate Evolutionary Function" that he added?" Jack stood silent for a while before telling them. 

"The Ultimate Evolutionary Function allows most of my forms to hyper-evolve my forms into their Ultimates. Granting them more new powers and new abilities that even make them more powerful than before. Though it could also add new or increases their weaknesses as well. And since Albedo, former Galvan and assistant of Azmuth and imperfect clone of Ben, added it to Emma when Khyber made an alliance with him, she can also do the same." He said, making Emma nod in agreement.

Ozpin's and Glynda's eyes widened an amazement and shock. Not only did Emma and Jack can turn into extraterrestrial beings from their respective universe, but can turn them into their "Ultimate Forms as well.

"Would the both of you demonstrate your Ultimate forms, Mr. Andros and Ms. Emma?" Gylnda let her curiosity grew. She wants to know how they turn into their "Ultimate Forms".

Jack and Emma nod as the former opens his MonTrix symbol and slaps down whilst emma slaps the Nemetrix on her chest as their respective light consumes them. When it died, Jack is now Tigrex and Emma is Omnivoracious.

Tigrex and Omnivoracious look at each other and nod before the former slaps the MonTrix on his neck, causing four spikes to appear as he evolves. Omnivoracious evolves as well though she doesn't have to touch the Nemetrix symbol.

Tigrex's orange color darkens with his blue being replaced by black, giving him a more tiger-like appearance. His wings merged with his forelimbs, causing Tigrex to lose the ability to fly, but his forearms grew muscular in shape. The bumps on his back morph into spikes as his teeth got longer.

"ULTIMATE TIGREX!" Ultimate Tigrex roars.

Omnivoracious grew twice her original twice. While her head and wings remain the same, her body gains a griffin-like appearance with red five claw-toed bird feet on each leg. And her feathers are now light blue.

"ULTIMATE OMNIVORACIOUS!" She caws.

Ozpin's and Glynda's eyes widened in shock and amazement. "Incredible." Glynda breathed as Ultimate Tigrex and Ultimate Omnivoracious devolve back to Jack and Emma.

"I believe that will be all for now." Ozpin said, standing up from his. "Well, Andros and Emma, I believe that'll be enough for now. Since it is already late, why don't you two go to either of your dorms and you can continue talking about your adventures with her. Also, dinner is from 6 to 8 PM." Ozpin stated in an authoritative tone, directed towards them with a small smile on his face.

"Thanks you, Professor Ozpin." Emma bows as she and Jack went to their dorm. As soon as they left, a peculiar though occupied Ozpin's mind. "This is turning out to be an interesting year....."

Emerald Forest

Somewhere deep within the Grimm-infested area, a red portal appears with a male person coming out as it quickly closes.

The person is revealed to be an 11 year old boy with white hair, red eyes, a black and red shirt, grey pants and black and white shoes. He appears to have a red device on his hand.

It was none other than Albedo. He manages to escape and made a portal to a new universe after he found Jack was "MIA".

"So this is the world he landed in, Jack Andros." The boy let devilish grin. "I can't wait what this until has to offer."

Several growls caught his attention as Beowolves and Ursas came out of the bushes looking for a meal.

Albedo raises an eyebrow, but shook it and selects an alien on his Ultimatrix. "I don't know what you are or where you came from, but if I were you....." He slams down and turns into his newest form yet, Ultimate Rath.

"I'd rethink the situation." Ultimate Rath finishes as he roars and charges towards the Grimm with his claws ready.

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Alien Data

Ultimate Omnivoracious

Species: Evolved Omnivoracious. The predatory species of the Galvans

Abilities: Has a griffin-like body, can fly faster

Weaknesses: Still cannot adapt to climate change

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Monster Data

Ultimate Tigrex

Species: Evolved Flying Wyvern

Abilities: Super strength, roar can knock back opponents as heavy as a Congalala

Weaknesses: Vulnerability to the Thunder Element increases, loses his wings therefore the ability to fly