Finding the Phantom Blade Zero cell key means you'll be able to unlock the jail cell just outside the Weeping Creek Valley outpost. If you're exploring thoroughly, there's a good chance you'll find the key yourself, but it can be hard to remember exactly where you've looked already, and it's very easy to miss if you’re focused on the main quest. I'll admit, the cell's treasure isn't especially exciting, but it's still useful and worth backtracking for. So, here's how you get the cell key in Phantom Blade Zero.
Phantom Blade Zero Cell Key location
To get the cell key, head through the outpost, passing Forge and the Outpost Bell, until you go through a wooden doorway at the top of some steps and find a glowing red shrine.
From just before the shrine, follow the path to the right that goes uphill and you'll reach a wooden shack. Head inside the main room of the shack, then head right, climb through the window, and go up the stairs. You'll find the cell key on the ground next to a dead guy.
Now head back to the cell outside the outpost and interact with the door. Soul will automatically use the key, letting you grab a Blackstone Fragment within. Unfortunately, that's all there is to get and this fragment doesn't do anything on its own as you need a total of four fragments to create a full Blackstone. However, doing so permanently increases your Attack and Guard Break by 10%, so gathering these fragments is well worth it!
While you're in the Weeping Creek Valley, make sure you also begin the Phantom Blade Zero Festering Secret, Phantom Blade Zero Four Fierce Axes, and Phantom Blade Zero Flesh Lily quests. And if you're unsure on any aspect of the game at this early stage, make sure you check out my Phantom Blade Zero tips too!
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