QWGHLM C ASTLE WAS a Dark Ages citadel that had all too obviously failed its essential purpose. Indeed, most of it was not even competent to keep out sleet and rats. Its lee corner, where it gripped the living rock of the Sghr, had, however, at least put up a struggle against gravity. It supported a row of stark crenels that finger-combed the tangled winds above the crunchy wilderness of smithereens and guano that accounted for the rest of the Castle.