So where did this first reaper come from? Harbinger as he goes by was created by the Star Child harvesting the Leviathans and thus the first Reapers were created. So yeah that's crazy right?
Do they explain how did the star child harvests the Leviathans if he doesn't have a reaper army yet? He needed the army for the ME races which have to be way less advanced than the Leviathans and all of their mind controlled species.