Mass Effect: Ghosts
The Terminus Systems are located on the far side of the Attican Traverse, beyond the space administered by the Citadel Council or claimed by the human Systems Alliance. It is populated by a loose affiliation of minor species, united only in their refusal to acknowledge the political authority of the Council or adhere to the Citadel Conventions.
Their independence comes at a price; the Terminus is fraught with conflict. War among the various species is common, as governments and dictators constantly rise and fall. The region is a haven for illegal activities, particularly piracy and the slave trade.
At least once a year, a fleet from Terminus invades the nearby Attican Traverse. These attacks are typically small raids against poorly-defended colonies. The Council rarely retaliates, as sending patrols into the Terminus Systems could unify the disparate species against their common foe, triggering a long and costly war.