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

Final Battle!

After the light had finally died down, Rimuru and Shiro noticed that the two had become one.
Yuuki and Ivaraj merged together.
Rumuru who had realized this had shouted at him
"Are you mad, merging will kill you after a long time, souls can't bear the burden of another foreign one clashing from within." The merged beings had laughed out loud and said "But we aren't clashing, I, Yuuki am in control of the body and Ivaraj is in his true dragon core making sure that we never run out of energy no matter what." Rimuru had understood the principle and nodded 'That is indeed possible."
"How many times have you practiced this?" Yuuki had once again laughed and said "Enough times. Now, are we gonna continue this small talk or are we gonna continue the fight?"

Rimuru didn't answer and just appeared in front of Yuuki in an instant, Rimuru had slashed out with her sword and split Yuuki in two, he then faded and appeared behind Rimuru "Too bad, that was just an afterimage." Rimuru didn't turn around and instead ducked down and swooped Yuuki's leg while Shiro blocked his attack with her scythe, Yuuki didn't want to get too close to the scythe because he knew how it functioned.
Rimuru had sheathed her sword and lunged forward at Yuuki, Yuuki noticed the tiny sphere in Rimuru's hand and grabbed her hand, he then pulled her closer and was punched in the face, the sphere he was looking out for had smashed into his face and exploded, Rimuru used this opportunity and reunited with Shiro.
The power gap wasn't big, all Rimuru had to do was wait and even with the seal she could still beat his ass every color of the rainbow, Shiro on the other hand was flickering, her form was shifting and her soul was unstable, Rimuru took notice of this and send her to Ciel, Ciel knew what was going on, but Rimuru didn't care, as long as she would be okay, Rimuru didn't mind.

Rimuru left Shiro there in the care of Ciel and focused back on the fight, Yuuki asked "What? Your lover in a bit of an unstable state?"
Rimuru's eyes flickered with unsupressed killing intent, Ivaraj was shivering inside of his core and Yuuki took notice not to say something like that again. Rimuru made her sword disappear and instead got a tiny knife, the knife had turned black, just like the meridians visible through Rimuru's skin. Rimuru used her enhanced physique and appeared behind Yuuki, she used the tiny knife and sliced at Yuuki's back, Yuuki didn't care about the consequences and just dodged, the outer realm shook as the massive power was released and straight up cut through the void, from one side to the other side of the void, everything was split in two, even a couple of the lower realms, Rimuru didn't care about destroying things because she used a barrier that restored everything, it takes time, but there was nearly no energy consumption and was this fine.

Yuuki had taken notice of the power and made it his life's mission to avoid that knife at all costs, because otherwise it would actually cost him his life.
Yuuki noticed Rimuru putting away the knife and letting out a deep sigh, Yuuki took this chance and blitzed Rimuru, he created a new weapon out of Ivaraj's dragon core and cut Rimuru in two, Rimuru turned her head and her two half's merged back together, Yuuki asked "Are you kidding me?" Rimuru noticed the surprise and said "No, I can't die and you can't permanently damage em, you are no match for me, Yuuki." Yuuki jumped back in time to avoid the punch that blasted a hole in the void and heard Rimuru say "Only 4 minutes left." Yuuki thought this meant that Rimuru could only hold on for another 4 minutes.
So he dodged and dodged, he didn't even try to land an attack and simoly waited for Rimuru to lose her power.

After 3 minutes, Yuuki noticed that something was wrong, but he didn't notice that over time he was getting more and more serious, his blows would be matched with stronger blows, his kicks would be countered and his legs ripped off only to regrow in a millisecond, Yuuki had taken into account that it take only 3 more seconds for Rimuru to lose her power.
2 more seconds and Rimuru was not slowing down, an uncountable amount of blows were traded in a second.
1 second left and Yuuki was startig to feel dread building up in his chest, he looked at Rimuru and instead of exhaustion and losing her power, the moment the 4 Minutes were over, Yuuki was caught off guard with an attack that made him lose his right fingers. Yuuki had regrown them in a second, but Rimuru didn't let down the blows, they only became faster and faster and stronger and stronger.
The black meridians under her skin were started to color into her skin and were giving off a dangerous feeling that Yuuki didn't want to touch, he avoided the face and went for cou tearing instead and going for the guts.
His fist had pierced Rimuru's clothes and landed on her belly button, Rimuru had smirked as Yuuki had touched one of the black lines, Yuuki pulled away his hand and noticed the black hue lingering on his hand, his hand was staring to crumble, Yuuki was staring to panic, but taking into account that Ivaraj was still there, Yuuki performed the next stage of fusion, he used Ivaraj's unsuspecting soul and hsi domineerring will in conjunction and erased Ivaraj, his dragon core was left and because of the fusion had permanently become Yuuki's core.
Yuuki had now used the power from that core to neutralize the energy and absorb it in order to study it. Due to having lived there for eons, Ivaraj had learned what it was and that information slipped into Yuuki's mind, he used that information and made it his own.

Rimuru noticed the black aura disappear and the next second felt the surrounding void energy enter Yuuki's system.
Rimuru thought to herself 'It took Ciel so long and it only took you a couple seconds to learn how to use "Turn null" that's not fair.'

<Master, I am insulted, I had mastered how to use it In minutes, your body was simply not capable of bearing the energy. There is also the fact that Yuuki gianed his knowledge form Ivaraj who had spend his life there since the dawn of time.>
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The end.
Hope you enjoyed.