The Giants' Key is a Key Item in Xenoblade Chronicles. It is required for The Giants' Key. It can be found in Satorl Marsh on a high plateau southeast of the Silent Obelisk.
The Giants' Key can be found by traveling southeast from the Silent Obelisk until three paths appear, then taking the left path which eventually leads to a tunnel. On the other side of the tunnel is a plateau. When The Giants' Key is active, the plateau will be guarded by Deluded Igna. Once they have been defeated, the Giants' Key can be found buried near a tree on the plateau.