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Mass Effect 3 Hints
Hades Nexus: Prothean Sphere
1 of 5: In the Citadel's docks holding area, go down to the end of the long walkway that goes past the cargo holds to overhear the conversation that gives you this mission.
2 of 5: After you finish the "Priority: Rannoch" mission, travel to the Hades Nexus cluster, then go to its Sheol system.
3 of 5: Look for the planet Gei Hinnom a ways "south" of the sun, then do a scan near it.
4 of 5: Orbit the planet so you can do a planetary scan and find the Prothean Sphere artifact.
5 of 5: Return to the Citadel and go back to where you got the mission, then talk to the refugee to get some credits and rep points, plus a war asset update.