Glass Hills

Despite their name, they are not really made of glass, but the hills did become transparent due to the unearthly amount of magic used to lift the Cities in the Skies. They are entirely invisible to those looking at it from more than five miles away, which can make unprepared travelers quite confused. Another danger of this location is that all the creatures native to the area also became invisible to the eyes. Animals such as bears, mountain lions, poisonous snakes are all invisible, and their numbers are extensive due to the difficulty in killing them.