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...
will generate monsters inside 
the dungeon in no time!
ستُولِّد وحوشاً داخل الدّيماس
!خلال فترة قصيرة
die er freisetzt, werden im Nu
viele Dämonen entstehen.
sai quante bestie selvatiche
compariranno in un attimo?!
criará monstros na masmorra
em pouco tempo!
Монстры по всем этажам мигом народятся.