Mass Effect 3 Walkthrough

Mass Effect 3 Valhallan Threshold: Prothean Data Drives Side Mission Walkthrough

Valhallan Threshold: Prothean Data Drives is a side-quest you can complete in Mass Effect 3, during the second act.

When to start

Before Priority: Perseus Veil


“An Alliance soldier knows the location of Prothean data drives that could help with the Crucible project.

Recover them from Garvug in the Valhallan Threshold and bring them to him at the Citadel docking bay.”


Alliance Engineering Corps War Asset


To start the quest, visit the Normandy Dock: Bay 24 and the Viewing Deck.

Speak to the soldier you find there to receive the quest.

To complete this quest, use your Galaxy Map to find the Valhallan Threshold Cluster.

Travel to Paz System and scan Planet Garvug to get the Prothean Data Drives.

Return with them to the soldier in Bay D24.

Next side-mission is Nimbus Cluster: Library of Asha.

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