Exorcision War (討祓戦Tōbatsusen) is the event that serves as culmination of the conflict with the Dingir. It is told during the Heroic Saga G event, and is also the main focus of said event.
Z/X Encyclopedia Entry
Battle of humans and dragons to counter the final war conducted by Dingir Enlil.
After the Dingir put the "Neo Schuster" that was deployed deep below Nagoya under their control, they developed sonic weapon "viral voice" that forcibly incinerates humanity (it forcibly mechanize humanity when its was developed by the Blue World). By adding it to the singing voice of Type.XIII whom everyone listen to, and spreading it through the Killer Machine and some Metal Fortress, they caused enormous damage in various places. Countless "Qillatu" with high Depth also rampaged after they appeared through the "Divine Gate" that fell from the White World. Furthermore, "The One", strongest individual created by the Red World, and even Uriel, originally the most powerful person on the White World, simultaneously became the follower of Dingir and brought merciless judgment to the humans and dragons.
The gods miscalculated.
Humanity has greatly progressed ever since the "Godbreaker War" where Dingir Gilgamesh descended. The Five Worlds that usually planning to destroy each others has united. They are prepared with concrete means to oppose the Dingir, such as "Asipu". Dragon Miko, who took the stance of supporting humanity from the sidelines, has come to the battlefield. Cthulhu, visitor from the Othersea and the natural enemies of the Dingir, has intervened.
The gods have no choice but to admit. Their own defeat. The strength of the people.
The following are "result from the perspective of humans and dragons" for major battles of "Exorcision War" and "certain personal struggles" that happened simultaneously with it.
Humans & Dragons Faction
Viral Voice Army ※ Killer Machine "Qillatu"
Yamato Tennoji & Crepus Animus Black World Z/X Cthulhu
Honome Chogasaki & Kalavinka Red Dragon Miko, Meiraru Green Dragon Miko, Kushuru Red World Z/X (Part of Kitakyūshū Army) Green World Z/X (Millennium Land)
Lower-Rank Dingir "Qillatu"
Sakura Kamiyugi & Phosflamme Michael White World Z/X (Twelve Apostles, Ten Radiant Saints) "Asipu" Cthulhu
White Dragon Miko, Nino Black Dragon Miko, Barahara
Nergal Ishtar Ereshkigal (Ghost)
Sera Kurashiki & Orichalcum Tyranno Kasuga Kurosaki & Nei Soma Kembuchi & Feuille Dr. Kurashiki (Sela)