Goblin Slayer Side Story II: Dai Katana, Vol. 4 (manga)

The party descends to the second floor of the Dungeon of the Dead for the first time to put an end to the newbie-hunters—the real scruffy men. But to even have the chance to fight these heinous creatures who have all but renounced their humanity and are capable of going toe-to-toe with the strongest adventurers in the Fortress City, they must find a way to conquer monsters that cannot be slain via conventional means...

Volume 4 of the Goblin Slayer Side Story II: Dai Katana manga series by Kumo Kagyu.