The only lore I have is that for some reaon, a group of people wanted the squad's abilities. Since there was no-way to actually get these abilities by normal means, they had to extract them. How so? They needed to tranquilize. However they killed instead so they'd be the ONLY ones to have tha abilities.. only I survived..
I have at least 1 thing from each of ya so I don't forgor about it.
Vengance also ends their life after destroying the people's base of where they kept everything. The explosions with Vengance placed destroyed everything, and nothing was left. Not even an atom was left of the place. Now with it over, Vengance can move on.
When Vengance moved up(to their surprise), something familiar happened to them, finally making them feel hapiness again.
Soooooooooooo that's the lore ig