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Nessus: Recovery Operation
Find Undamaged Vex Parts by defeating Vex on Nessus without using abilities, Fusion Rifles, or other weapons that cause disintegration.
"The obelisk requires some maintenance. It has been inactive and unguarded for a long time. We can use parts salvaged from the Vex's machine bodies to reinforce the obelisk's structure. But fight carefully, Guardian—we'll need the materials in good condition." —Transmission from Osiris
Legendary Quest Step