Dungeons were different from labyrinths. Labyrinths were intricate, magical constructs with respawning monsters and had unique laws to them, perfect for a reliable way to grind XP with as little danger as possible because the monsters' levels were equal to the floor they spawned on.
Dungeons, on the other hand, were normal constructs created by mortals. A dungeon could be the tomb of a long-lived mage full of his secrets, the hideout of an undead lich researching necromancy, the lair of a monster hoarding valuables, etc. There were no confusing things about dungeons; they were filled with traps and other defenses to protect the owner and their belongings.
Technically, we already raided a dungeon back when we cleared the goblin camp with Ayame and Blossom a few days after my transmigration.
"I see. I'll have to take the elixir from the creature's hands then." A happy nod was the only response Luminara offered.
