Where do you go after talking to the hermit? I remember he said to meet up with someone but I can't find him.
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Meet up with haru. A guy in the tavern at the docks. You'd need to get the access to do the docks by doing the graveyard quest for the noble man whose house is above the future seer's house.
After that talk to the barman in the tavern opposite to his house. He'll open the pathway to the docks.
After going through the sewers go inside the tavern in the docks and talk to haru. He will give you the key after mentioning hermit.