L'manburgians

A person, who though the world had been alone years ago, stumbles upon a very advanced civilization, but when that civilization turns to dust, who's side Are they on, who do they stick with?

if I get any of the plot wrong please comment and tell me I will try to fix it
Some shipping (DNF, skephalo, the usual)
4 or so oc's as well as a few plot changes here and there.
If any cc states they uncomfortable with things like this I will delete it