do Exo guardians count dying and being rezed as a reset? if they do does that mean the lowest you can be is -2? How do they know how many times they were rebooted before they died?
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Your first 2 questions have already been answered, so let me answer the last: all Exos are programmed to remember their name and reset number. So when Exo guardians are rezzed for the first time, that's the only thing they know about themselves!