5th or 7th level sounds accurate, unless I were to use it in the Underdark. Then it would be level 10 at least. My dream campainge which I affectionately named "Underdeath" is an adventure into the deepest regions of the Lowerdark to stop a powerful, beholder/hive mother/necromancer and halfling lich from unleashing an undead apocalypse... Its interesting to consider how the drow, druegar and deep gnoms and other races would be dealing with the crisis. Iv already determined that the ilithids would likely leave back to space becuase they cannot control the undead. Thats how i would start the story, illithids suddenly appearing on the surface. Followed by undead creatures emerging from caves and sewers ect ect.. Can you imagine an undead choker? Terrifying! and a halfling or even kender lich LOL!
Ohyeah.. Those are not pitfalls, just solid rock or perhaps the tents? Although, I could easily use them as pitfalls.. Thank you for the inspiration.