Author's Note:
I am the first who has published a Crossover work between Ben 10 X The Owl House, I am proud of this fact.
As I promised I am bringing to life this encounter between the worlds of magic and aliens.
In the beginning I wanted to create a human alternate universe, to put Luz, Amity, Eda and Lilith in a camper through America and the adventures of Ben 10.
But after several internal discussions I am convinced that it is better to keep the adventure on the Boiling Isles.
Adding a pinch of my creative mind.
Title: Witch 10, the Master of the Omnitrix.
Plot: After The Intruder events, Eda and Luz get close to each other. Mrs. Owl wants to do something nice for Luz and takes her to a campsite. Too bad a strange capsule falls from the sky and Luz ends up getting the most powerful weapon in the universe, the Omnitrix.
XXX
Episode 1: And Then There Were 10 (I)
Chapter 1: The SuperLuz story begins
POV Narrator
The space, considered by many to be the last frontier, where only the best of the best can reach it
A place full of mysteries and the greatest enigma of all is this question: Are we alone in the universe?
Unfortunately, the answer to this question is no, we are not alone in the universe, you may be wondering why this is a bad answer.
Simple, instead of having attractive and sexually open green or blue women, we have an intergalactic warlord.
His name is Vilgax, considered by all to be one of the most dangerous, greedy and brutal sentient beings that ever existed. His appearance is that of a green-skinned humanoid, wearing some sort of red-black spacesuit. The most iconic feature of him, his soulless red eyes, no, his head that looks like a terrestrial squid.
In short, the antagonist of this story is a distant cousin of Chutulu.
The intergalactic warlord is inside his massive warship, precisely in the control room, sitting on a metal throne, surrounded by his robotic servants.
The squid man's attention is centered on a holographic screen showing his white whale.
A small spaceship mostly dark black in color with several purple colored parts.
At first glance it appears that this small ship was designed for speed and freedom of movement.
The spacecraft itself is not important, but its cargo is a completely different story.
The spacecraft is carrying an object that can be considered the most powerful weapon in the universe.
Unfortunately for Vilgax, this ship does not wish to be hit and sink.
It may not have tremendous stamina or firepower, but it is incredibly hard to hit.
The small ship did not stand still for even a second, managing to constantly put hits on Vilgax's warship, experiencing minor damage that continues to accumulate.
"The damage to the hull is 37%, but the system is still operational." A robotic drone informed its owner, that Vilgax doesn't like what he is saying, rewarded him with a well-placed punch to his computer system.
"I have come too far to be denied. I have sacrificed my entire fleet of warships to keep the escort at bay and be able to pursue this ship!" Vilgax said, having put in too much effort and killed too many people to stop there.
"The treasures of the Star-Forge are mine, I will have the Omnitrix and the rest of the cargo. No living thing in the galaxy can stand in my way!" Vilgax proclaimed, before ordering the brainless drones to drop energy shields and focus all energy on the offensive systems.
Bad idea, think only of the attack without deigning to a minimum defense ... there will be consequences.
XXX
Change of scenery, we leave the infinite space in favor of the scene of a haunted house.
It has been a few days since Luz Noceda discovered the secret of Eda, her magic teacher and new mother figure in her life.
Eda Clawthorne, referred to by all as the Owl Lady, has been cursed to transform into a huge Owl Beast if she doesn't regularly take a Potion.
This is one of the reasons why the Owl House, Esa's sentient home, is located in the middle of the forest, away from Bonesborough, one of the largest towns in the Boiling Isles.
Most people when they discover Eda's secret, keep walking away not wanting to be near a living bomb that can explode at any moment.
Fortunately for Eda, Luz Noceda is no ordinary person.
The young human didn't want to go back to the Human Kingdom or seek out a new teacher of magic. Instead he decided to stand by Eda's side and help her as best he can to make the curse more bearable.
Eda not wanting to admit out loud, but was deeply touched by Luz's kindness and the fact that she doesn't want to leave her like everyone else did.
The Owl Lady having trouble expressing her effect not being a very emotional person.
So he decided to do something nice for Luz, taking a cue from an old childhood memory.
Eda promised to take Luz on a hike in the woods, wanting to teach some things about the local fauna and flora.
"Luz, you haven't brought a little too much stuff, will the camp last a couple of days at the most?" Eda asked, sure that her energy apprentice is exaggerating again.
"I want to be ready for any eventuality." Luz replied, struggling to drag a huge camping backpack filled to the brim with all sorts of objects.
"Doubt you could lift your backpack." King said, agreeing with Eda that Luz is carrying too many unnecessary items for her sake.
"That's not true, I can take my luggage." Luz said, grabbing the backpack with both hands, preparing to lift her luggage.
The young human provoked with all her might to lift the luggage without too much success.
"Damn nerdy arms." Luz muttered, blaming her weak arms for not being able to lift a big backpack.
King had to hold back a heavy laugh at the sight of the human girl's physical failure.
"Luz, stop if you continue like this you risk hurting your back." Eda said, acting like a Mother Owl, drawing a magic circle to make Luz's luggage fly away.
"I'm going to pack up again." She said Luz, her face red in embarrassment, avoiding eye contact, not feeling happy that she made a fool of herself in front of her Eda.
The girl ran up the stairs, going to her room to re-pack.
As soon as she disappeared from Eda's sight, there was a loud crash of someone falling and hitting the floor.
" Did you get hurt ?" She asked Eda aloud, hoping Luz wasn't seriously hurt.
"I'm fine, I just tripped!" Luz replied, having had the misfortune to climb the last part of the stairs, there is a reason why you shouldn't run up the stairs.
'What am I going to do with my little girl?' Eda thought, putting a hand on her forehead, beginning to wonder if it's a good idea to take Luz to a campsite.
Eda has grown fond of the human girl, but not blind to Luz's innate ability to get into all sorts of trouble imaginable.
"I bet a Snails that Luz will end up attracting the wrath of a griffin or something similar." King said, wanting to make a bet with Eda, forgetting that the last bet nearly reduced her to being lunch for a giant snail.
"You will lose as usual. I bet Luz will surprise us both, this night will not be like other times." Eda said in a confident tone. Clutching King's paw, accepting the little dog / fox demon pup's bet.
The Owl Lady if she could see the future, she will find that she is both right and wrong at the same time.
Luz will be able to surprise all the inhabitants of the Owl House, going through an unprecedented adventure that will have repercussions for the entire Boiling Isles.
XXX
Returning to space.
The little black and purple colored spaceship is not having a too happy time.
This space battle between maneuverability and firepower did not end in favor of the small spacecraft.
After avoiding the incessant shower of lasers from Vilgax's ship for hours, the spacecraft's engines overheated and had to reduce speed by 30% to prevent an explosion.
This allowed Vilgax's ship to hit its target, namely the engines.
"The propulsion systems were destroyed on the other ship." One of Vilgax's drones announced, showing the image of the inert spacecraft.
"Excellent. Get ready to board. I want the Omnitrix and the rest of the cargo in my hands!" He ordered Vilgax rising from the throne, ready to lead the boarding himself, nothing will stop him.
Except the self-destruct system.
The inert spacecraft just self-detonated, causing a giant explosion of epic proportions.
If this ship had exploded on Earth, at least it would have wiped out the whole of Tokyo, at worst the entire Kanto region.
Such an explosion is not just smoke and no fire, on the contrary this explosion has left behind a roast of radiation and esoteric energies.
Over 80% of Vilgax's spacecraft was hit by the blast, the radiation causing an electromagnetic pulse that burned all sensitive circuits and systems on Vilgax's ship.
If that wasn't enough, it inflicted damage on infrastructure and equipment, only 5% of Vilgax's drones were designed to withstand such an attack, the rest are good for landfilling.
The intergalactic warlord finds himself buried in the rubble of the control room.
Left arm and leg crushed, 80% of the body covered with severe burns.
Dozens or even hundreds of radiations are ravaging Vilgax's body.
"This won't stop me!" Vilgax yelled, promising himself that a miserable explosion won't stop him.
The space tyrant was badly injured, but Vilgax's story isn't over yet.
When the intergalactic warlord fainted, the few intact drones are already working on a way to save his master's life.
It will take some time, but Vilgax will come back stronger and more evil than ever, because what doesn't kill you makes you stronger and weirder.
XXX
Meanwhile the drones are so focused on completing their rescue task.
None of them paid attention to what remains of the damaged small ship.
If they did, they would have discovered that during the explosion the spacecraft catapulted a huge metal container that is heading towards a strange planet.
A world of purple oceans. Much of its earth's surface is covered with boiling oceans except for hundreds of islands scattered randomly around the planet.
The precious cargo for here Vilgax sacrificed his army and almost his life is rushing towards one of these archipelagos of islands.
XXX
Returning to the Boiling Isles.
Luz, Eda and King's camping is doing pretty well.
Several hours ago, Eda using her magic staff took Luz and King to a quiet gathering.
First of all, they unpacked the supplies. Then Luz and King set up the tents for sleeping at night.
While Eda lit the fire, preparing the Boiling Isles equivalent of a barbecue.
Before long Luz, Eda and King gathered around the fire eating burgers made from the meat of a monstrous bovine creature.
"Eda you should cook these burgers more often, they're delicious!" Luz said in a happy tone, enjoying her burger, no questions asked about the origins of the meat.
After her first week living on the Boiling Isles, Luz has learned that most local food doesn't get along with her digestive system.
And if he wants to eat edible without any problems, he doesn't have to ask what it's made of, or it will make it harder to chew.
"I'm glad to see that Yorox's flesh doesn't hurt you. I got off to cleaning the bathroom toilet or the floor." Eda said, in a relieved tone, vividly recalling Luz's early food problems on the Boiling Isles.
A whole night spent helping Luz get the scarlet worm noodles out of her system.
"This means no extra portion for me." King muttered, hoping to eat Luz's portion. Whenever her human friend can't eat a food, it means King gets his portion.
A bad look from Eda killed any selfish comments from King.
"Eda, the fire is about to go out, can I go get some wood for the fire?" Luz asked, noting that the fire began to lose intensity, wanting to do something useful for Eda.
Eda was silent thinking about the pros and cons of letting Luz go out and about in the woods, especially when night has just dawned.
"Eda, if the fire goes out we can't eat marshmallows!" King said, wanting to gobble up the cooked marshmallows that Luz has heard so much about.
Small as King was, his appetite is tremendously great.
"I'm a big girl, I learned my first spell a few days ago. I can get some dry wood to burn." Luz said in a determined tone, clenching her fists, trying to sound strong and capable.
For the Eda Luz's attempt to look like a boxer or something doesn't work.
Actually for Eda, Luz at the moment makes him remember the pet of her class, especially when Luz brings her fists close to her chest.
'Luz has so far fared rather well with the everyday threats from the Boiling Isles.
The area is safe. Many young witches who study the magic of plants, animals and oracles are in the area to line up or have fun with the family.
What's wrong with that? ' Eda thought, sure that none of Luz's typical misadventures will happen today.
Half an hour later, Eda will curse herself for naivety.
"As you wish, Luz. Go get some dry wood, but don't go too far and don't be late or King will eat all the Marshmallows." She said Eda, ruffling Luz's hair, deciding to let Luz go get wood for the fire.
"I will carry on this mission or my name is not Luz Noceda!" Luz said, acting like a knight who accepts the mission from his king.
Once Luz has started walking towards the forest all alone.
Eda's newborn maternal instinct has ignited against her will.
If the Owl Beast could speak, it would surely have screamed something like this: "Don't let our chick go into the forest alone! There are predators lurking in the dark!"
"King, go help Luz with the wood. It's starting to get cold and I want a bigger fire to keep me warm." Eda said, inventing an excuse on the spot to send King to stay near Luz.
King prepares to comment on how a king doesn't stoop to gather wood.
Too bad that Eda's gaze and stern tone of voice are capable of nipping in the bud any protest that King can come up with.
"Once we get back to the Owl House, I want a big cake for this job." King said, in an annoyed tone, preferring to stay close to the fire. But not knowing that he can't escape this job, he can at least get something sweet at the end of the job.
XXX
A few minutes later, inside the forest.
Luz is carrying a small pile of sticks in her arms to burn.
Seeing that he had collected enough wood, he decided to return to the camp to eat marshmallows with Eda and King.
I look up, Luz is able to see the magnificent starry sky of the Boiling Isles, finding it a breathtaking view.
"We don't have such a night sky in the Human Kingdom.
The full moon is so beautiful, I wish I had a telescope to look at them closely.
Maybe next time I could ask Eda to bring a telescope and teach me about the constellations of this world. "Luz said, unable to take her eyes off the starry sky. The more time passes, the more things about the Boiling Isles capture Luz's heart. .
Suddenly Luz's eyes can see a shooting star.
"This reminds me of an old, incomplete fanfiction line: A shooting star ... I'm a little big for that. But I wish a livelier summer. Maybe some superpowers and a nice waifu." Luz said, quoting a strange fanfiction about a boy who finds a magical artifact that turns him into legendary warriors to protect the world from great evil.
"Not lucky enough to have such an adventure. But it would be great to have not only the magic, but also my own Transformation Trinket." Luz said, letting her imagination come to life.
"The Great Luzura, the Most Powerful Witch and Heroine in the Universe!" She joked Luz, grabbing one of the wooden sticks, swinging them in the air like a sword or magical scepter.
The human being completely alone in the woods could behave in a more eccentric way than usual, not having to fear being ridiculous in front of Eda.
Stopping playing with the stick.
Luz raised her head one last time, seeing a strange astronomical phenomenon.
The shooting star seems to break into several pieces that I go their separate ways. One of these pieces of shooting star suddenly changed course, plummeting straight towards her.
Luz's underdeveloped self-preservation streak has come into action.
Ditching the dry wood completely, Luz starts running like crazy, not wanting to end up being crushed by a meteorite.
Without thinking twice, Luz throws herself into the bushes, curling up on herself, trying to protect her head and vital organs, expecting an explosion.
BOOM!
Fortunately Luz was not reduced to being a mere spot on the ground, the meteorite fell about ten meters away from Luz.
"In the name of The Good Witch Azura, what just happened?" Luz asked no one in particular, putting a hand over her heart to calm it down.
The near death experience is nothing new for Luz, the Boiling Isles are a pretty dangerous place, but never before has something fallen from the sky to nearly kill her.
"LUZ!" King's voice rang out in the forest. The little demon pup just managed to find Luz, then he ran to hug Luz's legs, worried she might get hurt.
"Luz, are you okay, I heard the explosion !?" Ha King, continuing to squeeze Luz's leg, not wanting to let her go.
"King, I'm fine, I'm just shocked at what happened." Luz replied, wondering if she used all her luck to fulfill her wish to arrive in a magical world.
Because the chances of being hit in full by a meteorite are astronomical to say the least.
"What was it?" King asked, wanting to know what fell from the sky, having never seen or heard anything like it.
Luz's fear was soon replaced by a fledgling meteorite curiosity that nearly struck her.
Luz may be a fantasy and horror fanatic, but that doesn't mean she's not a penchant for good science fiction stories.
A strange meteorite crashing into a magical world seems to be the beginning of a beautiful story plot.
"There is only one way to find out." Luz said, pointing to the area of the impact that is not far from their position.
The human and the young demon began to walk in the direction of the impact.
XXX
Back at the campsite, Eda begins to worry about Luz and King.
The Owl Lady may have no blood ties to either of the two children.
But that means nothing to Eda, Luz King is part of her family for her. If anything bad ever happens to either of them, Eda could never forgive herself.
"Maybe I'm just exaggerating?
Luz is not very strong, she may have a hard time hauling wood, and King may waste Luz's time with his rants about royalty. "Eda said, making up explanations about Luz and King being late.
"If within ten minutes none of them come back. I'll go find them!" Eda said, pulling a watch out of her wild hair, waiting exactly ten minutes before embarking on a search and / or rescue mission.
XXX
In less than a minute the two arrived at their destination.
Both were left speechless at what they found in the long run of the impact.
A trail of large trees that have been reduced to mere toothpicks, a giant crater that is emitting a cloud of steam.
"What is that thing?" King asked, pointing to the center of the crater, managing to see something large in the cloud of steam.
"Could it be a meteorite or a satellite if the Boiling Isles have satellites?" Luz said, not entirely sure how the Boiling Isles equivalent of the internet and radio waves actually works.
"What is a satellite?" King asked, baffled by this question. Proving that the Boiling Isles have no concept of space travel or the interest of flying among the stars.
"I'll tell you later. I want to see what's in the center of the crater." Luz said, wanting to get an answer to her curiosity, not to provide an explanation for human technology, especially when her knowledge of satellites is incredibly limited.
Luz, unable to stay still for long, approaches the edge of the crater, slowly peeping out.
Managing to notice a huge silver sphere, covered with circuit-like symbols, having a sparkling optic in the center.
"It's not a meteorite, it looks like some kind of eye, could it be a UFO?" Luz asked, having no problem considering the existence of aliens, after all she lives in a magical world populated by witches and demons.
As if the universe wanted to give a final push, the ground beneath Luz's feet collapsed.
With no solid ground, Luz slipped into the crater, eventually landing on her back.
"Luz! Are you okay? Should I call Eda !?" King asked, ready to call for help if Luz was seriously injured.
"Yes, I'm fine with just a few scratches and small bruises." Luz replied, seeing that she hasn't seriously hurt herself, even though her clothes will need a good wash.
When Luz prepares to exit the crater.
The possible UFO has gone into operation. The circuit-like symbols have begun to glow, the sphere's optics projecting a heavy yellow fluorescent light, striking everything in its range.
[Environmental Scan: Complete.
The capsule is located on Planet 208-LUAMY aka Boiling Isles.
Smart life form, found.
The life form found is a young female specimen of the Homo Sapiens species.
Thorough scan of the subject.
Requirement 001 [XXX]: Confirmed.
Requirement 002 [XXX]: Confirmed.
Requirement 003 [XXX]: Confirmed.
Requirement 004 [XXX]: Confirmed.
Requirement 005 [Genetic Compatibility]: The subject demonstrated compatibility with Omnitrix of 99.8%. Confirmed.
Requirements 001 to 005, completed.
Release of the Omnitrix to compatible subject.] A robotic, emotionless voice declared, finding Luz suitable for holding her content.
"I just got scanned by a UFO !?" Luz muttered, not believing her ears and eyes.
Before Luz could understand what was happening, the sphere-shaped object opened, showing its contents to Luz, a strange device similar to a bracelet or a watch.
The device is dark black color composed of a metallic material, decorated with different of dark purple color segment.
The device in the center has a dial that displays a bright purple symbol similar to an hourglass.
In front of the dial there are three month purple colored buttons in order to form a horizontal line.
"A clock?" Luz asked, with a confused face. Having imagined something completely different coming from a machine capable of analyzing DNA just by looking at it.
"What's inside that metal sphere?" King asked, wanting to understand what's going on.
"It looks like a clock. But what is a clock doing in space and why does it say I'm genetically compatible?"
Why do you have to be compatible to use a watch, are aliens genetics snobs? "Luz said, having more and more questions about what's going on.
A normal person would have turned his heel and ran very far from the crater fearing that the aliens or the men in black would suddenly come out to get him.
Too bad Luz is not normal and rarely acts like the majority.
The girl without risk or the consequences of touching an extraterrestrial object, reaches out to pick up the clock-looking device.
However, as his hand hovered over the device, he lunged and gripped Luz's left wrist.
"AAH GET OF ME! GET DOWN! GET DOWN!" Luz cried out, frightened by the device now attached to her forearm, continuing to shake her hand to drop it, fearing that she might lose her hand or life if she doesn't take it out.
"LUZ!" King yelled, jumping into the crater to help Luz.
The human girl seeing that King wants to help lowers her arm to make it possible for King to touch the device.
"Get off my boo ‐ boo buddies!" King yelled, trying to pull the device out of Luz's position.
"King, stop it you're hurting me and think the clock is starting to get angry!" Luz shouted, seeing the hourglass symbol begin to shine stronger and stronger, looking like she is building up energy to do something.
King differs from Luz to a very good instinct for self-preservation, so once he heard Luz's warning he stopped speechless.
"Let's try something else." Luz said, picking up King, stepping out of the crater with no more surprises ... for the time being.
Putting King down, Luz grabbed one of the branches she picked up and tried to use it to detach the clock-like device, but eventually the branch snapped.
"I think we should call Eda. This thing doesn't want to break away for the world." Luz said, confident that the aliens have built something that can withstand simple sticks and stones.
King, taking a more focused look at the strange device, manages to notice something potentially useful.
"Luz, maybe if you press one of those buttons this thing might come off." King suggested, finding no other option than to wield a sword to cut Luz's entire left forearm.
"What have we got to lose." Luz said, shrugging. By deciding to press the first button in the row.
When Luz pressed button number one, something unexpected happened instead of dropping the device.
The bracelet released a kind of liquid metal that covered Luz's body in a single instant.
Before Luz could scream out of fear or King ran for Eda.
The human girl did not find herself choking or stuck in a metal cocoon.
He actually found himself inside some kind of space armor or high-tech suit.
A video game fan would say the armor is reminiscent of the futuristic yet archaic outfit from the Video Game's Warlock, Destiny 2.
{Imagine the complete set of Warlock Armor: Reverie Dawn. Only in purple and black color. With the Omnitrix mounted on the left wrist}
"It's not a watch, but it's a real and authentic, Transformation Trinket!" Luz exclaimed, in a stunned tone, not believing that her expressed wish for her has come true ... in an unusual and potentially lethal way.
"That thing is some kind of artifact to create instant armor!" King exclaimed, looking in wonder at the device, not knowing that he had described one of the characteristics of a Transformation Trinket.
Feeling a kind of tingling coming behind the left ear.
Luz began to scratch her ear, discovering a small band that curved around her own ear, with a small microphone bent along her jaw.
Pressing the only existing button, Luz was surprised and delighted to see a helmet spontaneously spawn on her face and head.
"This is a new level of fantastic." Luz said, finding the experience incredibly beautiful as she presses the same button over and over, stretching and retracting her helmet over and over.
"What else can this artifact do?" King asked, wanting to see what Luz's new toy is capable of.
"There is only one way to find out." Luz said, raising her left wrist, deciding to press button number two, hoping to receive a flying motorcycle or a futuristic weapon.
When Luz hit the second button. Instead of initiating a second transformation or arsenal invocation.
The dial turned up and the purple hourglass image changed to become a kind of rhombus, then to create a miniature hologram of a strange humanoid moth-like creature combined with a ghost, possibly an alien.
By turning the dial to the right, the hologram has changed, showing the image of a completely different life form that appears to be composed of magna and fire.
"Maybe it's some kind of database on extraterrestrial life forms?" Luz thought, believing that the device found was some kind of tool for space exploration.
Instant armor to protect yourself from space or an unfriendly atmosphere.
A potential database for understanding the culture of an alien race or something.
"Maybe if you press the dial something good will happen?" King suggested, who was pretty sure the watch-like device could do more than just display holographic images.
"At this point I can't go back." Luz said, taking a deep breath, placing a finger above the dial.
Luz pressed the dial and her entire body was enveloped in a huge flash of purple light.
[Henshin Heatblast!] A robotic voice similar to the voice of a young adult with a British accent comes out of the alien device during the flash of light.
In place of Luz is Heatblast, a plasma-based life form whose body is composed of a super-hot internal plasma body covered in dark reddish brown volcanic rocks.
Being a fire-based entity, his body radiates high amounts of heat. Its feet have a slight oval design with only two toes and a toe.
His tongue is also made of fire while his collarbone resembles a volcano that generates a fiery "hair" that covers his head, leaving his mask-like face with no nose or ears visible.
On top of his chest is a disc with a purple symbol resembling an hourglass.
"Ugh ... what happened?" Heatblast asked, undergoing the transformation so quickly that he doesn't understand it's happening
Heatblast rubs his head, sees that King is sitting on the ground shaking with wide eyes.
"King, what's wrong do you sound like you've seen an alien, why do you look smaller than usual and why does my voice sound more ... mature?" Heatblast asked, beginning to notice the differences induced by the transformation.
"Luz, look at your hands you're burning alive!" King yelled, figuratively losing his mind over what's going on.
"haaaaaaaaaaa!" Heatblast screamed, realizing she is literally burning alive.
XXX
Returning to the field.
Eda finally noticed the presence of a cloud of smoke rising from the forest and when she heard a cry she didn't waste any more time.
Grabbing her magic staff, the Owl Lady ran into the forest in search of her children, promising a very brute end for anyone who dares to touch them.
Keep it going ...
XXX
Author's Note:
I love Ben 10, Alien Force and Ultimate Alien.
I can't say the same about Omniverse and that lousy reboot.
But there are some things that have bothered me over time.
1) How come the Omnitrix, the most powerful weapon in the universe, was carried by a single spaceship? Instead of being carried by a Plumber army.
2) Why Vilgax, the intergalactic Warlord who conquered countless worlds had a single warship instead of a fleet and a heavily armed army?
Here is the answer.
In this universe the Omnitrix was being transported safely by a huge safety fleet.
Vilgax used his entire army to attack the Omnitrix's large security fleet, eventually sacrificing his forces in order to pursue the spacecraft with the precious cargo.
If anyone didn't understand, the Omnitrix was not built by Azmuth in this universe.
The genius of this universe has built a number of potentially dangerous inventions, having it transported to safety by the Plumbers.
This explains the existence of a protective armor for the user of the Omnitrix.
Because the creator of this Omnitrix did not create it as an instrument for peace, but as a real weapon to eliminate the enemy.
Bonus, the existence of a full load of alien weapons / inventions that have spread randomly over the Boiling Isles, I allow myself to take ample leeway when it comes to enemies and new ideas.