San Diego Stockade
You are newly awakened mages with eyes open to the wonderful and strange. However all is not well and you've found that you can no longer leave the San Diego / Tijuana area. A giant dome, invisible from a distance, but glimmering red and radiation hot as you approach keeps you from leaving. You are also not alone. Other mages hunt you and it's said they worship powerful masters that rule the fallen world from the Supernal realm.