Lusia

Lusia is (or was) an asari colony notable for being the flashpoint of the Krogan Rebellion.

Krogan space expanded to Lusia following their victory over the rachni. The krogan then started to colonize Lusia itself. The asari there appealed to the Council, and the salarians sided with the asari. When the Council told the krogan to leave, the krogan refused and their ambassador stormed out of the audience with the Council, daring them to take their worlds back. War broke out soon afterwards.