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.

Carrion's Betrayal and Rimuru's Demon Lord Proclamation

 * Banquet proposer: Demon Lord Clayman
 * 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 Clayman's subordinate.

Banquet Outcome

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


 * Demon Lords Rimuru Tempest, Frey, and Milim exposed Clayman's treachery: the plot with the former Demon Lord Kazalim to manipulate the Ten Demon Lords into acknowledging Clayman'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 Clayman 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 as well as Clayman's 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.

Tenma War

 * Banquet proposer: Demon Lord Guy Crimson
 * Supporters: Ramiris and Rimuru Tempest


 * Banquet objective: Addressing the betrayal of Velzard and Dino and sharing information about the upcoming Great Tenma War.

Banquet Outcome

 * Guy reveals information about the angelic and demonic Ultimate Skills. Leon discloses that he possesses the Virtue Skill Metatron.


 * Veldora and Leon are identified as possible targets.


 * Rimuru will send some of his subordinates to the other Demon Lords.

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 Ramiris.
 * The humans were the ones who named Walpurgis, the Demon Lords just stuck with it.