The phrase "said dungeon" is an idiomatic expression that means a place or situation characterized by confinement, restriction, hardship, suffering, or misfortune. Full definition
The look of the castle, the location of said dungeons in this grand adventure, caught me by surprise somewhat. (gamergeddon.com)
When you run a certain dungeon a lot, having weapons specifically for said dungeon is always useful. (dulfy.net)
Little is known about the story behind said dungeon, save that monster has been sealed within and has been waiting for someone strong enough to reach it. (randomnpc.com)