User blog:Imouto-tan/Twilight Rings

Twilight Rings are dungeons located in Destiny City and Fennmont. Ex Nihilo, originate from Twilight Rings. They were formed during the end of the Great Witch War, prior to the establishment of the Seven Magic Universities. The first Twilight Rings was the Pandora Labyrinth. Other Twilight Rings became active and were formally known and named ordered as the seven deadly sins and the demons in the Ars Geotia.

Ex Nihilo
Ex Nihilo are summoned from inside the labyrinth by a boss - called "Nevermore" - that presides it and causes these monsters to be released. Although it's not always specific where in Destiny City or Fennmont these labyrinths are from; it can be devastating to nearby towns or cities that could potentially be affected by these monsters appearing. This is why disciples from different year groups may be assigned to go to the front line to defend their hometowns or other locations within Destiny City or Fennmont.

All the Ex have their names from mythology-monsters or demons.