Based on my Final Descendent story. Frost Is not on good terms with Y/N and is doing his own thing. He's with some friends and they've called themselves the Cold Squad.
The Cold Squad all followed GB as she walked into a fancy house on a cliff side.
GB: Welcome to my home you guys.
Y: Nice place. So this is where you've been?
GB: Yep. I found my new home.
Frost: I presume you're going to want us to leave after a bit.
GB: Nah stay as long as you need I got the spare bedrooms. In fact I was gonna ask to join this little group thing you've got going on.
Hunter: New friend?
GB: That's right lil guy.
Frost: Sure, we don't mind.
GB: Nice. Also I needed to show you something, come with me.
They followed her once more as they moved into the garage, various pieces of technology were being worked on. There was also a whiteboard with notes on it. It spoke about how certain things in the universe have a cyclical structure and repeat themselves, one of these being the Y/N squad. So apparently there will always be one.
GB: Does Y/N have a brand logo.
Frost: Yeah, it looks kinda like his face. Why?
GB: Look at this.
GB handed Frost A small box that had an engraving on the front.
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Frost: This isn't right.
Y walked over and looked at it.
Y: Yeah Y/Ns logo doesn't have the sparkle on the eye. It's just the face.
GB: Strange.
Frost: Wait this can destroy the multiverse.
GB: That's why I was intrigued. Y/N isn't the kinda guy to want to risk that. The device is meant to break the heart of the multiverse but not destroy the multiverse in the process.
Frost: What would be the point in that?
GB: Probably to take its power, DaFuqBoom was massively powerful and he only had a tiny link to it, I estimate he had about 0.00000000000025% of its power and he could take down cities with ease. He just never did.
Y: So there's a Y/N Wanting ultimate power?
GB: Probably. Does anyone recognise Tampered A? That seems to be the maker.
Frost: Y/N accidentally made a Tampered Timeline, but there was no Tampered Y/N.
GB: Weird. What would the A stand for.
Ys eyes suddenly shot open.
Y: Alt.
Hunter: That's my dad right?
Frost: Yeah. But what do you mean Y?
Y: Alt referred to himself as A on signatures and stuff. Tampered Alt.
GB: You mean somehow someone changed the events of Alt's timeline and got 2 versions.
Frost: It would probably be possible.
GB: I went to check but my device doesn't work for timelines, only universes. But the heart breaker probably could.
Frost: Huh?
GB: I'm pretty sure someone was gonna commit suicide while using it because it's also a teleportation item, one that isn't limited to timelines. Problem is it has too much power and I haven't been able to open it to remove a few cells.
Y: Go on.
GB: We need an open space for the shockwave this thing will make. Specifically in Alt's home universe.
Frost: I got a spot. Everyone hold onto me.
Everyone did as they were told and they were teleported away. They appeared in a destroyed wasteland of a city as GB flipped the device open and began messing with a control panel. She threw the device down and suddenly flew up as Frost followed. Y grabbed Hunter and raised himself in the air as a shockwave spread across the ground beneath them.
Though suddenly tons of random titans and agents never seen before appeared. They all ran off into the distance, though Frost notably saw a male Tri Titan, a red TV Woman and many more random match ups of already seen concepts.
GB: Should we worry about that?
Frost: Y/N will probably deal with it.
Y: Fair.
The device suddenly teleported them all away as they appeared in a familiar location. The battle to cure the Infected Boombox.
Frost: Yeah this is familiar.
Frost saw an infected Boombox grab a glitch car out the sky, it had Alt Y/N in it, he had all his limbs and looked like Y/N.
Y: Y/N jump out!
Alt and Boombox looked confused as the original Frost tried to jump over and attack Boombox though he was simply vaporised by a cannon.
Frost: Wait will th-
GB: No we've changed the events this is a different timeline now, so that was a different you.
Frost: Phew.
They turned their attention back onto the Alt as he broke free using the glitch car, he seemed enraged.
Tampered Alt: Ill fucking kill you this time! I should have never cured you just so you could get infected again!
Boombox used a sound burst and then she blasted him into the ground as tons of rubble fell on him.
