Hey guys,

Recommend me any manga where a group of characters are journeying or trapped in a labyrinth or a big-ass dungeon. Preferably with dark elements to it and a serious story.

I got this inspiration after playing Dark Souls, where the main character (you) have to journey across a devastated castle-city filled with monsters.

Sounds like you're looking for a fantasy like setting?

Well, the manga I'm about to recommend isn't.

Torikago no Tsugai is about a bunch of people trapped in a theme park, which in the story, actually resembles a labyrinth imo. It's a survival manga.

Oh, there is Tsuyokute New Saga, which sometimes takes place in a dungeon. It's an RPG-esque setting. Not entirely sure about dark themes though.

King of thorns might be to your liking although it is not in an actual dungeon it does give the same feeling and it's complete

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Words to live by: "Let sleeping dogs lie"
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It's pretty famous webtoon: Tower of god not exactly dungeon but a tower

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"This world is like a shadow. Run behind it and you'll never be able to catch it. But turn your back to it and it has no choice but to follow you."
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'I wish someone would invent portable walls, so whenever I do something stupid I could always have a place to bang my head.'
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