when you get the ring just make your way up to the 3rd floor from the washroom, take a left it the 3rd floor and go up to the attic
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"I need to find something to cover my hands before I touch that again." This is where I got stuck. I have the ring, but I require another item to open the locked door.
I didn't see any sparkling light that indicates a key item to proceed, unlike the previous times, though.
EDIT: Nvm, I didn't notice the two rooms next to the one with the locked door. My bad.