Walpurgis Banquet

Walpurgis (魔王達の宴) is an event where all the Demon Lords who are part of the Ten Great Demon Lords, or later, the Octagram, gather. After proposing to hold the banquet, the approval of three demon lords is needed to confirm and schedule it. Absentees have to be prepared to face severe consequences, as this is a covenant established between all demon lords.

From humanity's point of view, these events happen rarely and are hardly mentioned in human texts. The truth is, there are many instances of Walpurgis gatherings that the humans were simply not aware of due to no impactful decisions being made. Many of the demon lords just regard the gathering as some sort of regular tea party, though in those instances there might actually be several absentees which are treated much more leniently.

The Walpurgis Banquet, in the eyes of the human nations, is typically associated with the beginning of a Great Holy Magic War. The last one being over a thousand years ago that resulted in a myriad of casualties and great calamities. Thus, it is commonly known as the banquet that brings chaos and destruction into the lands.

Demon lords are only allowed to bring up to two subordinates. There is a reason for this restriction — a long time ago, there was a newcomer demon lord who brought over a hundred individuals to flaunt their power. This infuriated another demon lord who just had her country razed and thus annihilated them to vent her anger. Therefore, it was decided that Walpurgis is no place for weaklings and each participant is only allowed to bring up to two attendants.

The seating order around the round table was decided based on the order in which one became demon lords.

Walpurgis Banquet: Carrion's Betrayal and Rimuru's Demon Lord Proclamation

 * Banquet proposer: Demon Lord Kleiman
 * Supporters: Demon Lords Frey and Milim.


 * Banquet objective: Addressing the issue of Demon Lord Carrion's betrayal of the council, and his co-conspirator Rimuru Tempest's Demon Lord self-proclamation alongside the murder of Kleiman's subordinate.

Banquet participants
Daemon Race - Guy Crimson "Lord of Darkness"
 * Attendants: Misery and Rain

Fairy Race (Pixie) - Lamrys "Labyrinth Master"
 * Attendants: Beretta and Treyni

Dragonoid Race - Milim Nava "Destroyer"

Giant Race - Dagruel "Earthquake"

Vampire Race - Luminous Valentine "Queen of Nightmares"
 * Attendants: Roy Valentin and Gunther

Fallen Race - Dino "Sleeping Ruler"

Winged Race (Harpy) - Frey "Sky Queen"
 * Attendants: Luchia, and Lycanthrope Lion Race - Carrion "Lion King"

Demonoid - Leon Cromwell "Platinum Devil"

Deathman - Kleiman "Marionette Master"
 * Attendants: Ninehead and Viola.

Slime Race - Rimuru Tempest "King of Tempest"
 * Attendants: Shion, Ranga, and "Storm Dragon" Veldora Tempest

Banquet Outcome

 * Milim reveals that she was not under Kleiman's control, as most of the assembled Demon Lords had believed her to be.


 * Demon Lords Rimuru Tempest, Frey, and Milim exposed Kleiman's treachery: the plot with the former Demon Lord Kazalim to manipulate the Ten Demon Lords into acknowledging Kleiman's invasion of Carrion's territory as legitimate, as well as approving of killing Rimuru Tempest and destroying his newfound country.


 * Rimuru kills Demon Lord Kleiman and is officially recognized by the other Demon Lords.


 * Demon Lords "Sky Queen" Frey and "Lion King" Carrion step down from the Ten Great Demon Lords. They became "Tyrant of Destruction (Destroyer)" Milim Nava's subordinates. Milim Nava gained their territories.


 * No longer having ten Demon Lords, the title of ”Ten Great Demon Lords” was changed to the ”Octagram” which means "The Eight-Star Demon Lords" by Rimuru Tempest.

Newly formed "Octagram"

 * “Lord of Darkness” Guy Crimson (Daemon)


 * “Destroyer” Milim Nava (Dragonoid)


 * “Labyrinth Master” Lamrys (Pixie)


 * “Earthquake” Dagruel (Giant)


 * “Queen of Nightmares” Luminous Valentine (Vampire)


 * “Sleeping Ruler” Dino (Fallen)


 * “Platinum Devil” Leon Cromwell (Demonoid)


 * “Rising Star” Rimuru Tempest (Slime)

Trivia

 * Named after Walpurgis Night- said to be when witches congregate.
 * The banquets are their most serious when an upstart proclaims themselves a Demon Lord without the backing of three existing ones.
 * Walpurgis was originally just a tea party between Milim, Guy, and Lamrys.
 * The humans were the ones who named Walpurgis, not the Demon Lords, they just stuck with it.
 * As of the Octagram's naming, only Guy, Luminous, Lamrys, Kleiman, Frey, and Rimuru brought attendants.
 * Milim never had official subordinates.
 * Dagruel and Dino are loners.
 * Leon preferred to come alone.