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Mass Effect 3 Hints
Irune: Book of Plenix
1 of 4: After getting the "Priority: Sur'Kesh" mission, visit the Citadel's Presidium Commons area. Go up the stairs near the elevator, then move to the back left corner of the room to overhear the conversation that starts this mission.
2 of 4: After finishing the "Priority: Tuchanka" mission, travel to the Aethon Cluster and look for the planet Irune "north" of the entry system's sun.
3 of 4: Do a scan near the planet, then go into orbit around it so you can scan it to find the Book of Plenix artifact.
4 of 4: After you finish the second "Priority: The Citadel" mission, go back to the place where you got this mission. Talk to the angry accountant to get some credits, rep points, and a war asset update.
