A motive device obtained from a mysterious ruin machine.
The machine it once powered may have been destroyed, but it continues to rotate all the same.
There should be no such thing as an energy source that can sustain itself forever in this world, and most research results obtained in the field of "perpetual motion" have been eventually proved false. Yet, this device is proof that a now-destroyed civilization once reached heights that present-day nations could not hope to match...