For the surface people, the only connection channel between the Earth and the Dark Moon are the two teleportation facilities known as the "Dark Moon Gate" or the "Long Bridge Ruins", which are located at the northern and southern ends of the Long Bridge Mountain Range, corresponding to two equally ancient teleportation devices on the Dark Moon. The surface people believe these two teleportation facilities are the two "bridge piers" left after the Earth-Moon Connection Bridge was destroyed by the Goddess with a single sword and believe that since the Long Bridge has been destroyed, the surface people can no longer actively open these ancient creations. However, the demons on the Dark Moon possess stronger technology than the surface people, and they used demon power and forbidden knowledge to repair their section of the connection bridge and can launch an invasion of the Earth every few hundred years—at least that's what the Church says, and most surface people firmly believe this.
