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

Destruction of the empire

The sky opened revealing many weird creatures, these creatures were giving off an otherworldly aura and the moment they heard the word 'Fire'
They opened their mouths and revealed sharp fangs, but that's not what the people cared about, it was the blue glow emitting form their mouths that scared them.

A moment later, all hell broke loose as the creatures fired blue beams all over the empire, every zone was affected and everyone was having trouble resisting, the Z-rankers were trying to hold off the creatures and the shockwaves emitting from their battles obliterated everything, the city was no more, the thousands of kingdoms and villages all fell under the might of their attacks.

The government was in a tight pinch and were even to forced to release the highest ranking adventurers, the adventurers were shattering space and killing hundreds of these dimensional creatures with a single punch.

After several minutes, all the creatures were killed and when the rankers flew back down to celebrate their victories, a static shock ran through the empire and a message was transmitted "Why are you all so early to celebrate, their not finished you know?" The rankers looked back and saw the massive army of dimensional creatures all well and perfectly fine, they were even stronger than ever.
The rankers flew back up and entered battle once more, but in order to do the least amount of damage, the rankers used their power and pushed the creatures out of the empire, Shiroari made an exception and let everyone exit the barrier, these rankers flew out with the creatures and noticed the giant crack with a slightly straining Shiraoiri, these rankers suspected that she was holding back the empire from entering the crack and flew straight past her.
Shiraori looked on and decided not to pay to much attention and widened the crack even further.

Another 4 Hours later and the battles were still going full throttle, some even broke out into straight up mass-murder.
Rimuru looked on from the sky and whispered "Humans are truly greedy creatures, even now on the brink of death are the government officials trying to secure their wealth and fly off to a different planet." Rimuru didn't allow it and even created a barrier around their ships that froze them in place, the ships were seen as faulty and were abandoned without a second thought.
They even went as far as to force animals that could fly into bringing them out of here, obviously the innocent animals were allowed to exit and the government saw this, but the moment the animals hit the barrier, the officials were blocked there and then, their plans had failed and their greed was to much, no matter what, they even tried to launch the world destroying bomb, naturally Rimuru didn't allow this and exploded the bomb in outer space.

Noone was safe from this, everyone that's safe has long left this empire. The forces were dwindling and Rimuru was enjoying every moment of it, she was even smiling contendly at the sight and then she said something horrifying, "Ultima was right, torturing these people is quite entertaining."
Shiraori got a chill up her spine and Ultima felt very happy for some reason and said "Rimuru must've talking about me, to celebrate let's torture them extra hard today."
All the prisoners were terrified and hid as far into the corner of their cells as they could.
Everyone knew that when Ultima was happy or angry that the torture would worsen by several magnitudes.

After another 2 hours of watching this spectacle, Rimuru was losing interest and just decided, "This is getting boring, let's let Shiraori start the process."
Shiraori saw Rimuru's gaze and understood, she immediately pulled the empire and waved her arms to the crack as if swinging a baseball bat, Rimuru was amused, but all the rankers saw the empire heading for the crack and their aura soared Instantly. The dimensional creatures couldn't hold back the rankers anymore and gave up, all the rankers headed for Shiroari in an attempt to stop her, but it was useless, the empire was already moving into the crack at light speed. The rankers tried their best to pull out the empire and the otherd were trying to enter the crack only to die by touching the dimensional energy. Rimuru was immune and could even absorb and use it as she wishes, even Shiraori was immune, but these people were to weak and had never experienced energy like this.

Rimuru first came here to find the people bothering them and eliminate them for good, but after searching for all the information, she found that all the truly strong people had entered a dimensional crack or had died long ago. This greatly disappointed her and made her lose interest even more. The empire who made her go through such a big deal was as worthless as anything, there wasn't even any good entertainment in the empire.
The best zones were the futuristic ones where they had a lot of technology that could be entertaining when used right, but there were only seven of those, 102 others were all about the same level as earth and all 9284 other zones were all from the medieval times or earlier.

After about a month, she felt satisfied enough and wanted to destroy it, not a big deal for her, but normally it would be considered impossible even for the better empires and planets.

After an entire day of struggle, the empire finally gave up and disappeared into the dimensional crack, there was no trace left except for the massive empty space.
Shiraori wanted to go back home to Ariel's planet and Rimuru couldn't agree more, after such an annoying day, it was good to be able to have a good rest and relax before the tv.

Meanwhile the empire inside the crack was.slowly breaking down and the people died due to corrosion from the strange energy.
A sudden massive shadow flashed by and stopped in front of the remaining empire, it spoke slowly and clearly revealed it's intentions "It seems she accepted it. I need to let them know."
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The end.
Hope you enjoyed.