10 - : Demon Lords' Banquet: Walpurgis

The Demon Lords' Banquet (Walpurgis) is a pivotal event in Season 2, Episode 22 of That Time I Got Reincarnated as a Slime , where top demon lords meet to discuss major world events. During this gathering, Rimuru exposes Clayman’s manipulations and defeats him in battle, leading to the restructuring of the Ten Great Demon Lords into the new Octagram. Information regarding this event is available on the Tensei Shitara Slime Datta Ken Wiki and Reddit . 10 Demon Lords Gather for Walpurgis | Slime S2 P2 E10 Recap