Y/n: the mechanical brawler of Darkus and Pyrus

chapter 10 fall of vail, new weirder, darkness awaken part 2

As battle rage on, vail having hard time to beat Argo balance breaker form.

Vail: damn it, Albion I need help here here!
Albion: I try help vail but my counterpart is stronger then me!
Y/n look at Rex, he smiled, which he Y/n look confuse with why he smiled.
Rex: this he got vail.
Vail mad as Rex activate his ability card on guthlet.
Rex: ability activate electric blast!

Energy of electric hits towards to vail, he activate his magic sheild block attack.
Vail: take this!

As he attack back to Argo, Rex activate ability card.
Rex: ability activate barrier blue

Rex: this been fun vail, but ga n e is over for you. I been dying to try out this special card made from other dimension. I discovered and made card with it your in a surprise now!
As he took out cars, symbol power on it as well.
Rex: ultimate fusion ability activate Revenge death ball!

(I don't own this,revenge Death ball is own by company)
Everyone jump as Y/n try to tell vail to get out there even Albion but vail is frozen in fear.
Rex: is over for you now!
As large black negative energy hits vail, vail screaming pain. So much light blocking until is over. As it clears, riad peerage, class 1a and Y/n team are scare of power of Argo. Argo return to ball form, and Rex smile to see vail on ground, eyes open but he is not moving.
Sizerch, ozpin and glynd run quick to vail yo check if he is alive. But sirezch check his pulse,and tells everyone.
Sizerch: he is dead.
The last of demon King bloodline is now dead by Argo.
Rex: Y/n be ready one day I will fight you.
He left as Albion turn on wings to dream with remain power.
Albion: as You known, I need host before I force to sleep!
But Albion notice jaune aura have high power, and found his worthy host.
As light shine towards jaune, he got wings spooke jaune.
Albion: jaune arc, you shown high level aura, which no mere human have that high. You are worthy to be my host and power of white emperor dragon.
As everyone happy for jaune, Y/n and izuku talk to each other.
Y/n: you have brother?
Izuku: no I don't remember but his last name is midoryia.
Y/n: ask your mom maybe she we knows.
Izuku: ok
As he left, Y/n look at his screen tablet shown Dagon stop breaking glass, and seems even in different dragon. It's always two dragon well fight in fate.
Y/n: hope we won't fight somthing dangerous.
But he well be wrong when back at atlas, shows overhaul is push to ground and afraid. A young girl name eri is save by winter, and person have gear on arm.
???: ability activate flare cannon!
Overhaul see is large black shadow mass, with terrified appearance with red eyes, and open mouth to shoot out red energy ball.

As it shoot out, overhaul got hot scream in pain before he died. As large mecha monster return to ball form.
???: test went well, let's go report to Ironwood now.
Winter nodded, and took eri with her as mystery person left.
Who was that person and why overhaul is doing in atlas?