The Dungeon from That Time I Got Reincarnated As A Slime, Explained
That Time I Got Reincarnated As A Slime is a popular isekai anime with rich world-building, especially the Dungeon that takes centre stage in the lore
Source: https://www.cbr.com/that-time-i-got-reincarnated-as-a-slime-dungeon-details/