Do the Noldor qualify? They hit the criteria (their recorded history goes back longer, a violent history not so much matured out of as depopulated out of, on the decline but leaving ruins and Ancient Artifacts that can't be replicated millennia later) but fail at being spacefaring aliens.
Do the Noldor qualify? They hit the criteria (their recorded history goes back longer, a violent history not so much matured out of as depopulated out of, on the decline but leaving ruins and Ancient Artifacts that can't be replicated millennia later) but fail at being spacefaring aliens.