Hopefully in the story, or sidequest, or a dlc I don't care which we get to find out who built the exo. Maybe a counter force anpgainst the Vex? A weaponized ghost companion? Souls of those returned from the void?
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According to what I have gleened from the lore, Exos were created by Humans to do multiple different tasks, one of which was to combat something but I'm not sure what, which scares me... What could have been so powerful that humans had to create the Exos to fight?