Thank you for playing ! I watched the replay and that was very interesting to understand what was confusing. I apologize for the few bugs on path, flashing druid camp and broken english here and there. I had a really limited time to do it, far less than the whole so I had to make choice about what to fx or give up.
You didn't make it to the end but you were very close, the text when reaching the valley specify that it will requires cooperation from villagerss which was hinting at having high charm expedition to find an illegitimate child, so all you had to do was to send a team with only bards and/or priests in one of the villages to unlock the last item that opens the door.
Thank you again !