Alliance of Nightmares

Alliance of Nightmares is a terrorist group formed by Morpheus to combat against the members of Eden, leaders of the mythological worlds, and to fight against the invaders of ExExE world.

Summary
The Alliance of Nightmares was officially formed in Volume 25, after Morpheus holds a conference in his base in Cocytus to invite the gods that agreed to his plans such as Erebus, Nyx, Melionë, Tartarus, Chernobog and Angra Mainyu. They began to discuss about the Cross Times Kiss that was led by Midoriya Kanzaki and was received a warning from Arthur Pendragon for attacking his aunts, which shaken some of the members.

In True Volume 1, Nyx began her move by wanting to use Ingvild Ryggen Leviathan and her New Longinus Nereid Kyrie to control powerful dragons like the Two Heavenly Dragons, Vritra, Wagyl, Ophis, Scarlet Grand, and Crom Cruach. However her plan failed as she was defeated by the combined efforts of Arthur and Ddraig, they eventually handed her over to Apollon, the current chief-god of Greek mythology, to determine her punishment.

In True Volume 5, Erebus sought disorder to Kyoto's Ley lines out of spite toward Enma and later Osiris for not joining their alliance. He was defeated by Arthur, but not before placing a curse on the latter to temporarily seal Ddraig's manifestation. Afterwards, Tartarus attempted to drag Eden into the Abyss, but Ophis, Wagyl and Lilith arrive with Garmr so Arthur can attain AxA and defeat Tartarus alongside Ddraig.

Privileges and Purpose
The group functions as an terrorist cell with the purpose of eliminating the Longinus users as they deem them a great threat and to eliminate the leaders of every mythological worlds. They created a army of Artificial Devils in order to defend their worlds against the invaders from ExExE world that is approaching Earth.

Trivia

 * In the Volume 24, Loki’s daughter Hel, King Enma, Osiris and Indra were mentioned as candidates to join them.
 * Hel was not able to join them because she was under strict surveillance due to her father’s previous actions and because she seemed to oppose Odin and Eden.
 * Osiris outright denied the request.
 * King Enma and Indra were considered very strict gods, so cooperation would have been unlikely
 * In True Volume 3, Erebus planned on vengeance against King Enma and Osiris because they rejected to join the Alliance of Nightmares using Azus, Gressil, Sonneillon and the Artificial Devils.