- The Grustrag Three Beacon can be purchased off Baro Ki'Teer in the Concourse section of the Tenno Relay for 125,000 and 200. Note that Baro Ki'Teer's stock changes with each appearance and this item may not be available on a succeeding appearance.
- To use the beacon you must equip it on your gear wheel which can be done in the equippment menu.
- The beacon can only be used in a mission where assassins are able to spawn. Visit Death Mark for more information on eligible locations.
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