The slaying part is because of the connection with Sumona/Amascut, and Thieving because all the rest of the theme fits into Egyptian/old Middle Eastern culture, the hanging Gardens of Babylon seemed like a good idea to me, especially as it could be the garden of the elitist part of the city. :p Also, Menaphos is the capital of the desert, the crown jewel of the area, it deserves some nice extra features, partly because they, as a city can operate totally independant. Of course, it are just ideas I got, but as I said: there's a lot of potential with the area.