DmitryDD
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I encountered the problem that was mentioned earlier regarding the passage in the mountains. I decided to return to the prophet's hut with the artifact set already collected, and it worked. Apparently, there's some kind of checkpoint in the script there.
I collected the artifacts in a random order.
I read that you need to take the hat last, but I took it second or third. I took the staff last.
For some reason, I intuitively decided to swim to the prophet's hut, and the quest was completed as soon as I reached it.
Maybe this will help someone.
upd
I completed the scenario. It's very interesting and beautiful, especially the mountains and the spiral-shaped ascent).