Make it so that they have to reach the highest level including motes of light. Exo will learn about their creation and who they truly are, humans will see how their species lost control and was taken over, awoken find out why they were sent to earth to help.
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Holy shit, have like a final mentor mission once at max level with all prior missions completed, that would be awesome.
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And a reward would be a class item specific only to finishing that questline. Like an exotic that doesn't count towards the 2 limit since class items don't offer buffs.
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Race specific rather than class specific and make it an exotic shader or band/cloak
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Race and class specific. Like and exo hunters cloak would not be the same as an awoken hunters.