Illium

Illium is an asari colony in the Imathea cluster which is introduced in Mass Effect 2 as the homeworld of the Dantius sisters. The world appears to be one big city, its skyline being almost identical to that of the Citadel wards. It is one of three known asari worlds, the other two being Thessia, their home planet and Lusia.

Illium is the meeting point of Commander Shepard and Thane, a notorious assassin.

Trivia

 * Ilium is latin for the groin.