The vorcha originate from Heshtok, a small, hostile, overcrowded planet which has been largely stripped of natural resources by successive generations of this fast-breeding, savage species. The lack of resources has resulted in a tight-knit, clan-based society in which rival clans wage constant war against one another for control of scarce resources. Even as their population grows, the vorcha constantly fight each other in fierce competition over basic necessities. This incessant warfare has made each generation of vorcha stronger and more aggressive than that which preceded it, but their continual lack of resources have kept vorcha society extremely primitive.

Many vorcha are trained by the krogan Blood Pack as mercenaries due to their savage nature and adaptability to different environments. The rest of galactic civilization regards them as pests and scavengers, and their presence is generally seen as a blight.

During the Reaper invasion in 2186, the Reapers encountered difficulties in harvesting the vorcha homeworld. Because the vorcha were not cowed by the Reapers' impersonal intimidation tactics and the effects of the destruction of resources like water were negligible given the vorcha could adapt themselves to survive, the Reapers devoted their efforts to immobilizing Heshtok's population and preventing the vorcha from contributing in the galactic war.



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