I don't own Ben 10 or Honkai Impact 3rd
AN: Let's a few things out of the Way the initial chapters are following the events of the London Holiday Manga, that is why it is a bit dry on the action part, and it isn't really much of a crossover, but I will assure you it will get there in time unless you want it all rushed like Star Wars Rise of Skywalker where we didn't even know that Palpatine was returning SOMEHOW, and without any sort of context.
And I heard some complains that Beverly doesn't have the Omnitrix.
That is because it is intentional, indeed this is a No-Omnitrix Fem Ben Story.
And the Real Crossover will happen at the start of the 2nd Divine Key Manga.
As for why it's taking so long for Beverly to go to Ben 10 Prime, is quite simple she doesn't have access to the 2nd divine key, which allows it's user to observe different dimension.
But Beverly will be stuck in the Sea of Quanta until she unwittingly makes her way to Ben 10 Prime.
Also this is the last chapter of the London Holiday Arc
Now onto the story
Who are you calling a kid, Mrs. Tennyson?" Otto asked Beverly, who paled a bit.
"I'm sorry sir, please don't cut my pay, I have rent to pay." Beverly apologized immediately, realizing that this was one of Otto's avatars.
"Please, Lord Otto stop calling him names, he's just a hopeless little kitten. And stop apologizing Beverly, it's not as if you are the one paying the rent as much as Schicksal is paying the rent for you." Bianca told them.
"By the way Lord Otto, what happened to your battle avatar?" Aske Bianca asked Otto which made Otto come up with an excuse.
"I... Had to ditch him as he was getting to much attention than was necessary." Otto said as he let out a nervous cough.
"Hmm... they probably took Susannah away." Rita thought to herself as she looked at the unconscious body of Catherine, until Bianca busted through the concrete.
"Hey Rita~." Greeted Bianca.
"Quite the Dramatic and... most unexpected entrance, master Durandal. I thought Lord Otto gave you an urgent Mission." Rita commented as she looked at the approaching Bianca, who was followed by Beverly.
"And Lord Otto is here to give you an explanation of what happened." Otto said as he stepped forward
"So you planned for this, Lord Otto?" Rita asked Otto who stood next to Bianca and Beverly, the latter whom had a sour look on her face as she didn't like being used as a bait.
"Indeed. It is something I came up to lower our enemies defenses." Otto said, and Bianca added for him.
"Lord Otto feared that the enemy had set a trap for us. Thus he told me to follow and protect you after my "departure" for a mission." Bianca told them which made Rita feel a bit appreciative of her Master's concern and as for Beverly, she didn't really care as she felt confidant that she and Rita could have handled the cat.
"I am very touched by your care and concern, master Durandal. But you should have more confidence in me and Beverly we am more than capable of handling this vile Honkai critter on our own." Rita as she summoned her Scythe and aimed it at the Stan.
"Please, Master Durandal... This devious, wicked, ill begotten fiend must disposed of immediately." Rita said in a somewhat angry tone.
"Hrrr!(Evil biped! You never defeated me in a fair fight! You and your friend are only alive because my idiot human told me to retreat.)" Stan said in an angry voice, but it's not like anyone can understand him.
"Please do let me dispose of this disease ridden, unwashed furball. I shall end it's noisome existence here and now." Rita said.
"Guys enough of this we must return to the Hotel, I am willing to guess that Otto has found information regarding the 2nd Key's whereabouts." Beverly said as she looked at Otto.
"Indeed, now chop chop, we have more important things to attend to." Otto said.
"What will we do about the cat Lord Otto?" Bianca asked Otto.
"Eh, do whatever you want with it I'm not particularly concerned with Jackal's bests." Otto said in a dismissive tone having no real interest in experimenting with Stan.
"Very well Lord Otto." Rita said as she dismissed her Scythe." Rita relented as she dismissed her scythe.
"Though what are we going to do about Catherine over there?" Beverly asked as she looked at the unconscious body of Catherine.
"Eh, I may have some ideas to make use of her. Besides I may have some ideas of where the 2nd Key is located." Otto said with a smirk on his face
At the Hotel
"So Otto, where is it?" Beverly asked as she slumped at the couch.
"Now, now Beverly you have waited so far, I am willing to wager you can wait a little longer." Otto said, as several Holoscreens appeared, some with the images of the crypt, Jackal, and Avalon.
"Now, we may have failed to capture Lady Jackal, who seems to be the enemy's leader. However Jackal managed to give us some valuable intel, however unintentional it may have been, that we can use in the future." Otto said as the image of Jackal was amplified.
"From her words, we can summarize that the 2nd key is located in a sort of spacetime pocket. And due to this, this pocket managed to isolate it's content and protect it from many forms of detection, which is why we failed to find the key thus far." Said Otto.
"So let me guess this straight. Due to this "Shield" we still are unable to find it?" Beverly voiced Bianca's question.
"I would agree with you on that. However Jackal did say "rested safely here for eons", with this in mind I think they didn't move the 2nd key after all this time." Otto said, when Rita brought a stool, of which Otto had some difficulty to get on.
"Now comes the big question. If Jackal was so confident that the key was safe, why did she even bother to stop us at Glastonbury Tor? And why did she even bother to lure us away from London as such I am led to believe that the key is hidden away here in London." Otto told them.
"And what makes you think so, Lord Otto?" Bianca asked.
"Good question, however I quote Lady Jackal: "Failed to detect it's presence even if was hidden in plain sight". This narrows down the search to the most obvious areas." Otto told the group.
"I have dispatched specialist mechs with advanced EM scanners to these location. These mech will cover the locations in special scanning arrays. EM emissions from any unit will be picked up another unit on an opposing side." Otto explained
"And how ill this work?" Beverly asked.
"Good question. Quite simple really, any hidden spacetime pocket in the area will accelerate the particles traveling through it. We will simply measure the time it takes to receive an emission. Any anomalous result will indicate the presence of a pocket and the location of the 2nd Key will be revealed to us!" Otto said with confidence in his tone.
"Arrays of Mechs with High tech scanners? I'm sorry lord Otto but isn't that a little to obvious? That Jackal will notice and will try and stop us again." Bianca said with concern in her tone.
"You're exactly right. But our enemy is in the shadows. And we can defend the most likely positions. I'll let you choose your favorite place." Otto told them
"All units are in place." Bianca, who standing on top of a bridge, told Otto over at the radio.
"My Battle has begun. Time to find the Holy grail of our quest and to see where the 2nd Key is truly located." Otto said as he activated the Mechs EM scanners.
"EM Receiver has picked up a spatial distortion. Space time pocket detected." Said Bianca when she looked at a cube with surprise in her face.
"Lord Overseer, I have visuals of a distortion geometry hovering 50 meters above the River Thames, and none of our mech seem to be able to breach it or detect the contents." Bianca informed Otto.
"I knew it wouldn't be easy in any way, but I have a solution to that. Charge and fire the Honkai Beam emitters at that geometry" Otto said as several Turrets brought aimed their Honkai Beam emitters and fired at the Cube.
"Concentrate all beams at a single point. We'll Breach the barrier." Otto said as the beams hit the Cube it shattered revealing the 2nd Divine key.
"Whoa the 2nd divine key actually looks... awesome." Bianca as she looked at the target of their mission.
"Hidden in plain sight but revealed by my ingenuity. Time to bag this and go home." Otto said as several mechs moved in to transport the 2nd Divine Key to the location where it will then be transported to Schicksal HQ.