Mera tapped the end of her dire lance on the ground as she thought about it.  "Maybe.  The Solars tend to be needlessly cryptic about this sort of thing," she commented, "but I think you might be onto something there...the running idea I had at the time was that a bunch of Air Castes used one of their charms to carve something out of the rock.  I think we should continue along this idea of supernatural power being what the Solars are discussing."