That Time I Got Reincarnated as a Slime (2018)

S03E14 Labyrinth and Storm Dragon

Rimuru is hard at work constructing a dungeon ahead of the approaching festival. This dungeon will include treasure chests filled with weapons crafted by Kurobe, and at the bottom level, Veldora will serve as the ultimate boss. Just when things seem to be set, Milim unexpectedly arrives with an idea...