"In other words the Walpurgis Banquet is just the Demon Lords gathering together to update each other on each other’s status while discussing trending topics. It’s just that the humans certainly wouldn’t know about that, but it’s really nothing dramatic.” ".Ramiris
When the time comes for the birth of a new Demon Lord, the other Demon Lords will not stay silent. If a fool freely calls himself a Demon Lord, he or she will be killed because they would have invoked the Demon Lords' wrath. However, if the said person could withstand the wrath of a Demon Lord, they themselves would be recognized as such.
But, a Demon Lord with such ability was not a common occurrence. Therefore, for a stranger to claim himself as a Demon Lord, it was necessary to get the support of at least two or more Demon Lords. As if you messed with the new Demon Lord, the supporting Demon Lords will become opponents at the same time.
There is a non-aggression pact between the Demon Lords. However, if one initiates a fight, they may gain the wrath of all the other Demon Lords.
The council had many different names in the past, the second-most recent being The Ten Great Demon Lords which was later changed by the Demon Lords to The Octagram through Rimuru's suggestion mainly due to Clayman's death and Frey's and Karion's announcement of stepping down and becoming Milim's subordinates, as well as the awakening of Rimuru as a True Demon Lord. Thus, resulting in them being reduced to 8 Demon Lords.
From time to time the Demon Lord Council gathers together in what is known as the Walpurgis Banquet. This meeting takes place in a separate dimensional space and is supposed to handle serious issues, however very often the members of the council just use it as an excuse to hang around and have a Tea Party, unbeknownst to mankind, who view every instance of Walpurgis as a precursor to a worldwide war or another Tenma Great war.
|Name||Nickname||Race||Status||Demon Lord Allies||Place of Residence/Domain||Other Allies|
|Guy Crimson.||Lord of Darkness||Demon||True Demon Lord||Leon, Rimuru, Dino||Ice continent||Velzard|
|Milim Nava.||Destroyer||Dragonoid||True Demon Lord||Rimuru, Ramiris||Capital of the forgotten dragon,
Beast kingdom Eurazaina, Harpy country Fulbrosia, Land of puppets Jistarv
|Ex-demon lord carion, Ex-demon lord Frey|
|Ramiris.||Fairy of Labyrinth||Fairy||Queen of Fairyies||Rimuru, Guy, Milim, Dino||Tempest Labyrinth||Beretta, Dragon Kings, Druids|
|Dagruel.||Rage of Earth||Titan||_____||Dino||Far west||__________|
|Ruminas Valentine||Queen of Nightmares||Vampire||True demon lord||Rimuru||Holy empire Ruberious||__________|
|Dino||Sleeping Ruler||Fallen Angel||True demon lord||Dagruel,
|Far West, Tempest, Labyrinth||Fallen Angels, Celestial Demons|
|Leon||Platinum Saber||Ex-Human||True hero||Guy Crimson||Unknown continent south of Sarion||Elemesia, Sorceous Sarion Dynasty|
|Rimuru Tempest||Newbie||Slime||True demon lord||Milim Nava, Ramiris,
|Jura-Tempest-Federation||Veldora Tempest Dwargon, Blumond
Sorceous Sarion Dynasty, Ex-demon lord Carion, Ex-demon lord Frey,
Demon Lord Domains
- Blue - Demon lord Rimuru
- Violet - Demon lord Milim
- Silver - Demon lord Ruminas
- Red - Demon lord Guy
- Yellow - Demon lord Leon
- Brown - Demon lord Dagruel
- White - Human nations
Ten Great Demon Lords (Defunct)
- Guy Crimson - True Demon Lord; Daemon Lord
- Milim Nava - True Demon Lord; Dragonoid
- Ramiris - Fairy Queen; Fairy
- Dagrule - Titan; Giant
- Ruminas Valentine - True Demon Lord; Vampire, True Ancestor Princess
- Dino - True Demon Lord; Fallen Angel
Kazaream(Replaced by Leon) Karion- Lion King; Lycanthrope (Became Milim subordinate) Frey- Harpy Queen; Harpy (Became Milim subordinate) Clayman(Replaced by Rimuru) - Marionette Master; Deathman
- Leon Cromwell - Hero; Demonoid
- The previous Ten Great Demon Lords took about 3 months to decide on a name. During that time the humans already named them without their permission in the first place.
- Rimuru only took 3 minutes to decide on a name for the current Demon Lords. (Octagram).