Tensura x Kumo desu ga, nani ka. Crossover.{COMPLETED}

Tempest emerges

After Rimuru searched their souls for any information, she scowled when she found nothing important, the only thing remotely useful was where their branch was positioned and even that is pretty useless when considering the dimensional crack.
The inside looks like a blue screen with many swirling distortions from the mere energy corrupting it, it's nothing like how the end of space/time looks, but it certainly is freaky, Rimuru wanted to enter immediately, but decided not to, she still had to inform Shiro and bring her inside with her.

She appeared back in her home instantly, almost like teleportation without space magic.
Even Shiro didn't detect the magic used proving how powerful Rimuru currently is.
Shiro rushed towards Rimuru and asked "Have you figured out what's going on?" Rimuru calmed Shiro down and sat down on the couch. Ariel who had also heard it rushed in and sat before them on the coffee table.

Rimuru started explaining "No, I've found the intruders but I have no idea why they're here, there is nothing in this dimension that could satisfy those creatures. The only information I've got is where there branch is. For this I'm taking Shiro and leaving for an unknown period of time."
Ariel stood up and paced around the room, she then looked at the both of them and asked "Are you going to be okay?" Rimuru hearing this gently smiled and gave a comforting smile "Yeah, we'll be fine." Ariel was still not sure, but there's nothing she could do anyway with their strength.

Shiraori packed everything she had and put it into her space storage. Rimuru didn't do that, but she knows that if need she can just come back.

After saying goodbye, Rimuru took Shiro and moved towards the crack in an instant, Shiro was used to this speed and adaptly quickly, she then looked around and noticed that the space in front of her was very turbulent and constantly distorting, Rimuru noticed this and showed Shiro how it looked like, Shiro looked at the space in front of her in a different light and rushed towards it, Rimuru grabbed her shoulders and said "You can't enter it, you have to use space magic and delve deeper to enter it." Shiro grasped what Rimuru was pointing at and gaped at her, she then asked "How can you do that, that takes like so much magic in order to break through the layers, it's not that easy." Rimuru disappeared from her sight, but her voice still lingered in her mind "See I did it just fine, I don't even feel drainage."
Shiro looked in disbelief at the place where Rimuru just reappeared, she collected her cool and asked "How did you learn how to do that?" Rimuru shrugged and said "Ever since those really long sleep times, I've felt that I could just move through the countless layers of space at will, I can even move just one layer, where I'm visible, but you can touch me, I'm intangible like this." Rimuru showed her moving through the layers of space and Shiro quickly noticed what Rimuru did, visible because the tiny warpings in space where Rimuru just went deeper, she looked at it and tried it, she then punched Rimuru in the stomach and felt the blow connect, space shattered and Rimuru was moved back to the main layer of space.

Rimuru recovered form the punch and said "Just like that. But we need to get to the 28 layer."
Shiro then said "Go to the 2nd layer and every time I tap you, go one layer deeper, unlike you, i can't willingly go between the layers, so you have to go and then I can follow." Rimuru copied and did exactly that, for every layer they went deeper, Shiro got a better grasp at it and on layer 17 she delved deeper before Rimuru could and showed that she finally could move on her own, so she got to layer 28 and was met with Rimuru waiting for her.

Shiro then looked back at the swirling space and noticed the faint blue glow emitting from it, Rimuru shared her vision with Shiraori and they quickly passed through the crack and entered the dimensional crack.

Rimuru then held the hand of Shiro who was clearly distracted by the massive change in sight, after entering the crack, she felt the foreign energy combining with her own and making her stronger by the second, her vision adapted quickly and the blue sight that Rimuru saw before had made itself known to her from her own eyes.

Rimuru noticed the energy hungerily combining with Shiro's energy and making her stronger, usually the energy would corrupt that person's energy and absorb it, but Shiro's energy instead made it submit and combine with hers as well as losing it's dimensional property, Shiraori quickly gianed a light shimmer around her being and started to gain control of the dimensional properties around her, there was no space in the dimensional crack, it's simply pure energy and the warping space are gates that connect this dimension to another one. This dimension feeds on the energy of other dimensions and this becomes stronger, it's an entity of it's own, luckily Shiro is stronger and thus it submits to her.

Rimuru didn't let down her guard at all, dimensions are never as strong as their tol fighters, some of the dimensions have beings that could destroy and recreate it within seconds, no matter how weak the dimension, never underestimate the locals.

Rimuru then went to the massive branch she saw in their memories.
They quickly arrived and noticed the massive branch, if it could even be called that, it was so big that it made the galactic empire look like a toy house in comparison to a galaxy, Rimuru didn't have either the patience or time to deal with such a huge hassle so she wanted to see how far Tempest has come without her.

Using her newfound power, she quickly crossed the many dimensions and sent a message to her clones, within the hour, a portal opened above the massive branch and the trillions of creatures living there were frightened by the power the portal was emitting, so Rimuru increased the power and a giant city floated through the portal, a barrier protected it and filtered the dimensional energy making it safe for everyone on it.
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The end.
Hope you enjoyed.