Balcony Key is an Key Item in Bloodborne. It was added with The Old Hunters DLC.
Balcony Key Usage
- Used to open the balcony door on the first floor of the Research hall.
- After giving Adeline Brain Fluid a second time she hands over the key.
- Can also be obtained by killing her, but effectively ends her questline and she doesn't drop Milkweed Rune.
- It's a key