Other alien species who are part of the galactic community include the krogan, a hardy and warlike reptilian species in decline due to the Genophage, a viral-weapon designed to sterilize the krogan species and suppress their high birthrate; the batarians, an isolationist four-eyed species infamous for piracy and other disreputable activities; and the quarians, nomads who were forced to flee their homeworld Rannoch when their development of advanced networked synthetic intelligence created the sapient geth, who warred with their creators. Due to this, the rest of the species in Citadel jurisdictions limit their reliance on artificial intelligence, using "virtual intelligence" (VI) that lack self-awareness. Omega space station, introduced in "Mass Effect 2", lies outside of Citadel jurisdiction and is noted as being a haven of corruption, piracy, and home to the organized criminal underworld of the galaxy; it serves as the "de facto" seat of government for the Terminus Systems (a collection of independent states, corporate fiefdoms and pirate domains), an alternative hub for alien species who are unwelcome in Citadel controlled space, or for activities which contravenes Citadel laws and regulations. "Mass Effect: Andromeda" introduces the angara, an emotionally expressive species native to the Heleus Cluster in the Andromeda galaxy, who are dependent on sunlight for sustenance.