Actually, IIRR the PCs from my campaign popped in, surprised the natives, and offed the main leaders quickly, so the mass fled from them. Then the lads ventured past the wall, got a look at things, and got out of there. I don't recall how they managed it, but they left, returned to attack the shaman and his guards, and eventually some of them faced Oonga...one getting trashed thus and the others escaping. Again, they knew they were seeking an artifact, but damned if i can remember if I had defined it as the Crook of Rao then. The module was published about three years after the last excursion by any PCs from my campaign, but the fellows at TSR play-tested it before it went to the printers.
Cheers,
Gary