Sekiro Shadows Die Twice: Where can I find the key to Gun Fort in Sunken Valley?
During your exploration of Sunken Valley, one of the locations in Sekiro: Shadows Die Twice, you will come across a locked door leading to the final boss of this location - the Guardian Ape. Read this page to learn where you can find the key to that door.

You will find this door shortly after passing by a Sculptor's Idol called Gun Fort. The next room is a boss arena - you will face Long-arm Centipede Giraffe. Defeat this boss.

The locked door is behind the large statue.

Go back to Ashina Castle and head to Upper Tower - Kuro's Room Sculptor's Idol. Check the left side. The library should be already opened by Kuro (you will also find a note informing you about that).

You don't have to speak to the boy. Gun Fort Shrine Key is in the interactive container next to him.
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