Rimuru is building a dungeon in preparation for the upcoming festival. It will feature treasure chests containing weapons made by Kurobe, and Veldora will inhabit the deepest floor as the final boss. Then Milim suddenly shows up with a suggestion...
When I evolved into a Demon Lord,
،عندما تطوّرتُ إلى سيّد شيطان
Als ich zum Dämonenkönig wurde,
quand j’ai évolué en roi-démon,
quando sono diventato un Re demone
Quando eu evoluí para Lorde Demônio,
когда я обратился Князем Тьмы,