Salarian

Salarians are a species renowned for their technical skill as well as their high aptitude for espionage. The Salarians have a seat on the Citadel Council. In the interstellar community, they have created many of the major technological advances that now fill the galaxy. They are one of the earlier races to join the Council.

Additionally, it has been revealed that the Salarians played a significant role in the development of the Krogan species. The Salarians provided the Krogan with advanced technology and a new, tranquil home planet (in order to manipulate the Krogan into eradicating the Rachni for the Citadel). The peaceful home planet and better technology put less strain on the Krogan as a species; they no longer had to worry about simply surviving on a dangerous planet with primitive technology, as they did before contact with the Salarians. This comparatively easy life allowed them the time and energy to spread, aggressively, through Citadel space, claiming formerly allied planets as their own. In order to end these "Krogan Rebellions" the Salarians then provided the Turians with the genophage that effectively sterilized the Krogan.