Goblin Slayer Side Story II: Dai Katana, Vol. 5 (manga)

The party has put down the scruffy men, ending once and for all the corrupted adventurers who had become the scourge of low-level Dungeon-delvers. These six heroes have no intention of resting on their laurels, though. Their quest is not one of money, fame, or mere good deeds—they intend to defeat the Dungeon of the Dead itself ! To do so, they must venture ever deeper, to the third floor, where a mysterious new threat awaits…!!