What is the Ancient Device? Where can it be found and how it is used in the Desolate Sands (Act 2)? Can it be used multiple times? (How else can I experience its possibilities?)

What is the Ancient Device? Where can it be found and how it is used in the Desolate Sands (Act 2)? Can it be used multiple times? (How else can I experience its possibilities?)

The Ancient Device is a random event. It takes up a large area of the Desolate Sands, as per the screenshots below.


Of the possibilities thrown up by the device, some are dungeons (like The Veiled Treasure), and some will likely be other affects.
Possibilities (so far):
I just randomly found this today on a plateau like area in the middle of the Desolate Sands. You can use it once then you need to find it again after reloading the level.
where the a small farming guide is available aswell.
– Riil Jun 07 '12 at 08:43