History of Sunken Cave

The Sunken Cave is a location in the Forest of Echoes where the Deep Defenses Trivial Mystery chest is found. Shacknews places the chest below the Ruins, in what the guide says might technically be the Sunken Cave. To reach it, use True Sight at the sign on the right-hand path, drop to a circular platform, and go down through a small hole in the rock, then activate the Barrier Breach sign on your left. Guides for this route are from the Season of the Lost era, so the layout may have changed.