The Key to Some Place is a Quest Item that can be obtained from three spots in the Mikage Furnace in Tatarasuna. Obtaining all three will grant you access to the Arsenal Gate, which is home to a coveted Luxurious Chest.
The Keys to Some Place are located in the three areas circled below. Follow along with the guide for a more detailed breakdown on how to find these well-hidden objects.
Key to Some Place #1
Upon heading to the area marked #1 on the map above, you’ll encounter a Thunder Barrier. Pass through it using an Electrograna from a nearby Thunder Sakura Bough. On the left, you’ll find a hole in the wall with a Common Chest inside. Open the Chest to get the first Key to Some Place.
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Key to Some Place #2
The location of the second key is pretty straightforward. Head to the area marked #2 on the map above and jump down until you reach the wooden platform connected to a broken bridge. You’ll find a Common Chest, which houses the second Key to Some Place.
Key to Some Place #3
For the third key, head to the area marked #3 on the map above. Climb or glide down to the rooftop with an Onikabuto. You should find a Common Chest near it. The screenshot above was taken after the Chest was claimed, so it’s no longer there, but the circle represents the exact position the Chest was in. You’ll find the third Key to Some Place inside.
How to Use Key to Some Place
All three Keys to Some Place can be used to unlock the Arsenal Gate, which is located in the area circled on the image above. The exact area isunder the cliff, so you need to jump down to the watery area to find the Gate.
Once you find the Arsenal Gate, interact with it and surrender all three Keys to Some Place to unlock the room. You’ll be greeted withthree Ruin Sentinels. After defeating them, don’t forget to claim theLuxurious Chest, as well as anEnigmatic Pagein the Investigate spot beside it. At the edge of the room, you’ll also find anElectroculus.
Opening the Luxurious Chest will grant you Primogems, Mora, Hero’s Wits, and the Diagram: Katsuragikiri Nagamasa. Owning the Diagram will unlock Wonders of the World Achievement calledBlade of Tatara.
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