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The order of the dungeons is the Flooded Caverns, then the Glacial Fortress, and finally the Temple in the swamps. In each one, you obtain a specific item that allows you to access the next. In the Flooded Caverns, you collect key fragments that you assemble into a large key. In the Glacial Fortress, you acquire bombs, which you need to blast open the entrance to the Temple. That's suppose to be the order unless I skipped something.
I’ve completed all of them, including the Temple’s boss. The Temple is clearly the hardest, since you must carry an item with a consumption enchantment to prevent sanity damage while inside, or rely on potions shenanigans.

Another lore tidbit: Isolde, Rosalyn’s friend, feels very real and not AI-generated. In fact, someone mentioned that in the code she’s described as an “energetic fennec” and living in the capital (Thalassar, I think) , much like Hayden, so we can assume she has a similar appearance to his.