This is one of those prying questions I've ask myself over the years. Was my guardian some random civilian trying to escape the collapse thus dying upon the hill he was resurrected on? Was he military? My theory is that my guardian was a member of some security team assigned to protect the colony ships from a mod of desperate people only to fall to the darkness like everyone did. What's your theory/story about who your guardian was before the collapse?
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He was a human who managed to save a little boy from dying, got -blam!- slammed, got rebuilt as an exo and was gifted the light because he was a good dude for saving that boy.