Haven was once a city in the middle of the desert at an oasis. It was completely filled with magic. The mages wouldn’t allow non magic-users into the city. They took Haven out of the desert to hide it from prying eyes. The removal of Haven caused a great hole in the desert, creating the black rock – where the magic was sucked from the earth. This was 480 years ago. 475 years ago, the mundanes attacked travelers to and from Haven and it became a huge problem (which is why they removed the city).