"This weapon… Despite not even being a Soul Weapon, I still can't believe how powerful it is. It might as well be the most powerful weapon in the entirety of Immortal Realm…" Chisato muttered to herself but her words were clear to everyone and when all of them heard it including Mio, all of them were stunned because they were so sure that it was a Soul Weapon, especially Mio. After all, she felt her Scythe shaking in fear when the Sword was unleashed.
"Well… I promised to defy all odds and reality and make the most powerful weapon under the category of Soulless, right? Heaven Devouring Sword just fits it perfectly, because it is the most powerful Sword to ever exist and is only below the Soul Weapon as it can't passively get stronger every day like you, but that doesn't mean that it can't evolve you know?" Yuki chuckled as she grazed her hand over the blade feeling its cold sharp edge with a light smile on her face as she remembered the days when she was using it alongside Chisato.
But that was a long time ago as she had already sealed the Sword away for some reason and now that she unsealed it again, she can't help be reminisce about the good times. But she quickly shook her head and she then looked at Mio with a cold smile on her face before motioning with her hand for Mio to come to her, this ignited something in Mio as she walked towards Yuki slowly before running and swinging her Scythe at her without any restraint, and with all of the buffs that she received from going all out, it was twice as power.
Even though Yuki blocked it with her Heaven Devouring Sword, it was so strong that it created a giant crater underneath her feet. Because of the tremendous force, she could even feel some of her bones breaking. The flames that were covering her Scythe suddenly busted out and engulfed her whole, making everyone's heart race as she took a direct hit from that.
"Nice try on that one… But that is exactly why I brought out this Sword… Because just as the name stands… It can devour anything, even the Heavens in the Immortal Realm~" Yuki said, and in just a blink of an eye, the massive flames that once engulfed her all disappeared, and to everyone's shock, she remained unscathed, there wasn't even any burn marks on her body, much less a scratch.
"Absolute Zero: Frozen Chains of the Night~" Yuki snapped her finger and suddenly their surroundings turned pitch black no one was able to see anything even if they used their Magic, but when they could finally see again, the first thing they saw was Mio being chained and rendered unable to move while Yuki was moving towards her slowly with a smirk on her face.
"I'm really proud of what you did, Mio. Today you showed me that you have truly the right to be my disciple and you made me proud after seeing how you fought… But… I know that you can still give me something more. Use your true Skill Series you know you can't hide it from me, I know that your Memento Mori Skills are only your second strongest, you have a stronger one that you are still hiding. Show it to me." Yuki said to her before piercing her chest with her Sword and kicking her back towards the ground.
She then simply walked away and waited for Mio to make the decisions. Being the administrator of their Systems, Yuki could freely see everyone's Status tabs and that means that she can see everything and that no one can hide anything from her. This is the reason why she knows that Mio's Memento Mori Skills are only the second strongest because she has a line of three more Skills that are even more powerful.
The only reason that it may seem that her Memento Mori Skills are the strongest is because of the backlash and setbacks that they have onto Mio making it really seem that they were more powerful, but she was something more. Yuki knew this even without checking her System because Mio's Memento Mori Skills are all using her control over Time, but she has something even more powerful than that…
"I guess I do really have no choice then huh, Master… I never thought that I would have to use it again as I swore to myself to never use it because it was just so powerful. But since you're the one who I am fighting… I'm confident that I can really go all out with you…" Mio said as she casually stood up not caring about the gaping hole in her chest as she simply healed it with her Magic before taking a different set of clothes.
But at this point, everyone was confused because they all thought that Memento Mori was Mio's strongest Skill, but after hearing the conversation between the two, it seemed that it didn't even come close to being the strongest. Even Solar was shocked as even though she was the longest one who accompanied Mio, this was also her first time hearing about it.
"Since Master knows it, then there's no real reason to hide them any longer. I'll use it once again, the same Skills that I swore to never use again. Eden's Gate…" Mio muttered to herself as she looked at Mio with a new kind of resolve, beneath that was the kind of arrogance and pride that Yuki wanted to see because those eyes as telling her that Mio had the real intention of beating her at that moment.
"That's the spirit that I like to see! Now show me how powerful those last three really are!" Yuki challenged her as she simply watched Mio to see what she was going to bring out. She was curious as she only saw the Skills on her tabs but she didn't read what they are and what can they do as she wants to see it for herself without in need of explanation.
"Eden's Gate: Universal Black Hole…" Mio whispered just enough for everyone to hear and suddenly the whole place got quiet, but it was not because they became deaf, but it was because of the black hole that was in Mio's palm that was devouring everything in its path, their shock even the laws and reality of their world couldn't escape it's grasp.
To everyone's astonishment, it then stopped when Mio held the black hole in her hand and grazed it over her Scythe making it absorb all of its terrifying power in one go, and the once pitch-black Scythe suddenly got an eye that opened menacingly, signaling that it has awoken from its deep slumber.
"I'll only use these two since the other one is meant for healing… Eden's Gate: Endless Void Slash!" Mio warned Yuki before raising her Scythe and charging towards her as she was running, she was breaking the Space and Time around her which simply shocked everyone including Chisato as she didn't expect to see this level of power in the Mortal Realm because this kind of power is almost as the same level of those that are in the Immortal Realm.
"This is it! This is the moment that I have been waiting for! Destiny Breaker: Heaven Shattering Slash!"