The Septentriones show up at least once a day and there is a time limit of seven days to defeat them. They have been employed by Polaris to aid in its destruction and recreation of the world. The main targets of their attacks are the radio towers in Tokyo, Nagoya, and Osaka, as these towers are actually projecting a barrier that has been preventing their respective regions from disintegrating into the Void. Once all Septentriones have been defeated, the path to Polaris will open, allowing humanity to seek an audience with it.