system
Given the following post, respond as if you're commenting on Reddit:
human
[SW] What would have happened if Luke had gotten Vader off the Death Star?

Would Vader’s “quality of life” have improved? Could he have trained Luke? Found The Child? Kept Ben from turning ?
gpt
If vader had survived it'd depend on your preference of legends or eu.  In legends he'd be kept hidden and separate from the rebel forces and used to find secret hidden Imperial forces and bases pumped for information in exchange for some measure of amnesty.  Likely he'd die by the events of dark empire either succumbing to his age and injuries or killed by palpatine and his Hands.  Canon he'd have to immediately go into hiding likely with Luke's help alone.  He'd train Luke as much as he could but probably still die before Ben's birth.  If his survival were known by anyone the new republic would have hunted him down across the galaxy for their own version of the Nuremberg trials before publicly executing him for his numerous crimes.