[[Image:|260px]] Cluster View SystemsN/A RelaysN/A Location: Milky Way / Crescent Nebula Prerequisite: Horizon (mission) (Mass Effect 2) Prerequisite: Leviathan: Find Garneau (Mass Effect 3) The Crescent Nebula is a medium sized cluster at the edge of asari space - a Terminus Systems territory near the borders of a thin section of the Attican Traverse. It contains four systems and includes the asari settled world Illium.