Isshin silently watches the ongoing war, it hasn't even been a day and both the edge of the castle and Huecon Mundo are being consumed by the chaos.
If it's not one of the castle's war machines either killing the Hollows or misfiring and injuring one of the knights, the hollows are either eating each other, being killed by the knights, or killing the knights.
Then there are the other races that he sees walking around, he would have once claimed that most of them belonged in the Realm of Beasts or one of the other worlds but he didn't know how the castle operated, so he just kept his mouth shut.
"Great another two outcasts." one of the knights says when he sees him and Ryūken.
"We're here to help, we both have fought hollows before." Isshin says to the knight who immediately points towards the king of the hueco mundo.
"The treaty that both sides agreed to stops him and us from doing certain things which is why we are playing defense and I don't know if the two of you have noticed but neither of you is as strong as you think you are." the man says to him as he opens his help screen before a light scans Isshin and Ryūken.
"The two of you are on the level of Vasto Lordes, no you're stronger than that." he says to Ryūken before turning back to Isshin.
"And you were stronger but you severed your power, Yeah looks like you will be back at full strength in no time." the knight says to them before signaling them to follow him.
"Tell me have either of you asked yourselves how you are here."
"I don't mean your souls, what I mean is how are your bodies here?" the knight asks them as the sounds of explosions and gunfire make it harder for Isshin and Ryūken to hear the man.
"The reason is that the Hollows have figured out a way of pulling people into Hueco Mundo, but we haven't figured out how they did it."
"The problem is that everyone that has abilities thinks that because they have their powers that their bodies should be able to handle the strain." the knight stops walking draws a handgun and fires at a hollow that was trying to attack them.
This is the reason we told everyone to train inside the castle, but all of you think that you can deal with tearing your bodies apart." the knight says to them before he starts walking and leading them to a large group of people.
"All of you have powers, all of you either hate each other or were banished from some other world or group."
"Or I don't know but you didn't listen to instructions so like it or not you're all under the command of the Exiled Black Swordsman, now get out of my sight." the knight says to them, before teleporting them to the town of beginnings.
The sounds of gunfire, men, and women screaming were coming from every direction and Isshin tried to gather enough power so that he could use Flash step or use some of the techniques that he had learned over the years, unfortunately, he wasn't able to do anything and only succeeded in making his armor change.
'What the hell?" he complained.
"You should have listened." he heard a voice that he hadn't heard in years say to him.
"Engetsu is that you?" Isshin asks his help screen.
'Yes, now since you chose to ignore instructions you should get your ass to some cover before you get yourself killed, give me a moment so I can understand how to use these new abilities." Engetsu says to him.
Isshin runs towards one of the nearby buildings, as he runs he can see his help screen moving as Engetsu looks through its information.
"Well I have good news and I have bad news."
"The good news is that you can use most of your abilities, the bad news is that all of our information is being collected, everything from spells, special attacks, name it, it's being studied and I can't stop it." Engetsu says to him.
Isshin looks around the room he can see that most of the people that are with him are people that he knows, some of them were Soul Reapers, while the others are people that he has never seen before.
"So why aren't I able to use them now?" he asks Engetsu and for whatever reason Isshin swears that he can feel his sword's spirit staring at him.
"Because your spirit energy is still connected to your son and daughters, it's keeping their powers sealed while keeping you weak." Engetsu answers him.
Isshin knows that Engetsu is right, but if he was to sever the line that's keeping the hollow fragments inside of his kids under control then.
No, he knows that Engetsu is right and if his kids are going to live through this he has to give them every advantage that they can get, even if that means letting those monsters out.
He closes his eyes and concentrates then he breaks the seal on his powers, his armor begins to let out a faint glow before going back to normal.
'What happened?" Isshin asks Engetsu who he can see smiling at him.
"Because you were wearing that armor when you broke the seal it contained the blast of energy that would have destroyed the building." Engetsu says to him before the roof of the building is lifted by a hollow that Ryūken immediately kills with an arrow.