In the base of the empire of Gundam we see barbatos lying down on a slab that's at a not so 90° angle
Flashback
Jack(barbatos) pov: I was doing my paperwork when Enterprise entered my room with a bunch of other including a bunch of armed guards
Enterprise: fleet admiral Jack yamata you have been charged with the execution of siren prisoners waiting to be interrogated I'm sorry but you cannot be allowed to live
Jack: wait this is some big misunder-gack(get shot in chest by Enterprise arrow)
Enterprise: gods take him away and make sure he sinks
Guard: yes ma'am
3rd pov
The guards carry Jack's body throughout the entirety of the base leading to the cliff
Guard1: guard 2 go find something to weigh this useless pile of meat down we can't have his corpse washing up now can we
Guard 2: right cut open is intestines can have him floating up
Well the rest of the guards start preparing Jack's body to never be discovered the second guard goes off and discover something a giant metal arm
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Left Arm only
Guard2: holy what the hell was this part of (into radio): hey we're going to need a couple of cutting torches because I just found the perfect thing a giant metal arm
Guard3(over radio): that's great how large is it
Guard 2: larger than my body entirely I mean this thing is massive heck I think only a single finger from this thing being enough to weigh down that dead weight
Guard3 (over radio): right we'll get a cutting torch down there ASAP
30 minutes later
Mechanic: all right so what do you need cut
Guard2: take off it's middle finger
Mechanic: all right but it's going to take a while this metal looks like it's a lot tougher than anything I've seen before give or take 3 hours
Guard1: yeah whatever just get it done
5 hours later
Mechanic: we have a problem whatever the hell this thing is made of my cutting torch ain't going through it not even a single scratch
Guard2: could blunt force work
Mechanic: yes sure why don't you get one of them shipgirls to light this thing up I'm pretty sure they could destroy this thing with ease
Timeskip: 5 hours
Bismarck:this thing absorbed everything we threw at it what the heck is it made of oh wait never mind a single finger broke off
Guard2: yeah hey Bismarck I know you ship girls are well over 10 times stronger than the average human (I don't know if that's actually true don't hound me) you think you could get a few of your friends to help get this somewhere
Bismarck: yeah let just make some calls
Mechanic (thinking): what's this asw-g-08 barbatos lupus rex who the hell would name something after a devil wolf King
Timeskip The guards and ship girls eventually got the giant finger to Jack's corpse tying him to the giant finger with heavy duty chain and then slowly pushing it off the cliff then report back to base but unbeknownst to them Jack was not dead in fact he was brought back to life by the soul of the machine they had just tied him to and that machine was about to give him a choice
In jack's subconscious
Jack: where am I
Barbatos: we are within your subconscious Jack
Jack then turns around to see
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Jack: who are you
Barbatos: my name is asw-g-08 barbatos lupus rex I'm a Gundam and I'm the very thing that they tied you to you have a thirst for revenge don't you I did as well unfortunately I cannot go back but I can offer you a chance to go in my place
Jack: what happened
Barbatos: me and my friend guisen rebake full City fought against countless hordes of graze units we were so powerful they had to orbital bombard us to weaken us guisen died first and then I had my head taken off
Jack: that's tough
Barbatos: which is why I want you to take my form rise up and take our revenge but I have to warn you you will become me you will adopt my personality do you accept
Jack: barbatos I do I'm going to make them pay and the sirens as well
Barbatos: excellent when you wake up search for a white Mobile suit known as rx0 unicorn he can help you
suddenly the white cathedral like room they were in starts to shatter and collapse signifying Jack or now barbatos waking up
At the bottom of the sea
The giant metallic finger that the corpse of Jack was tied to glows before combining with Jack healing him as multi-colored armor appears around him as he surfaces and when he breaches the surface he howled like a wolf signifying unicorn as to where he is as the new Barbatos looked around he heard a voice call out to him
???: Hello you must be barbato's new replacement
Barbatos then turned around noticing the White mobile suit
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Barbatos: rx0 unicorn I presume
Unicorn: spot on now come with me we're heading to our new home the empire of Gundam where you will learn to fight
Barbatos: nice(thinking with an insane tone of voice: look out of your lane and sirens a new competitor has entered your wall and nothing will stop me)