Quick answer: A dead Baishan disciple holds the Crimson Forest Secret Chamber Crank beside a brazier in the grille room on the middle level of the storehouse cellar. The crank opens a secret room at the end of the cellar pit.
Phantom Blade Zero puts this story item in Crimson Forest during Chapter 1. Getting it means working through a cellar with several levels and then backtracking to a socket post at the bottom.
Where the Crimson Forest Secret Chamber Crank is
A cellar lies below the storehouse beside the Cliffside Lodge bell. It remains sealed until you fit the Crimson Forest Cellar Crank into the socket inside the storehouse; doing so exposes a stairwell. The cellar has a walkway above a central tier of plank flooring and grille rooms, with a deep pit of chains and iron cages below. Look for the crank in a grille-enclosed chamber on the middle tier. From the plank landing on the far side of the chain pit, a marked chest is visible on a raised platform behind the grille. Head for that chamber.
Four Baishan Disciples guard the cellar: one patrols the upper level, while the other three are held in iron cages at the pit’s bottom.
How to get the Secret Chamber Crank
Inside is a BLACKSTONE SHARD, filed under “Key Progression Materials”. Its card reads “Collect 4 fragments to permanently increase Attack and Guard Break by 10%.” More on these is in the Blackstone Shards breakdown.
The item description reads “An iron crank clenched tightly in the hand of a Baishan disciple. It appears to open a secret door somewhere.” It continues with “Taken from her stiff, pale hand, the crank still holds some warmth.” When that card appears, you have the crank.
What the Secret Chamber Crank opens
A hidden room then opens right next to the post. Inside are wooden racks, a lattice screen and red candles set on the floor.
The open room and the talk prompt over the Severely Wounded Baishan Disciple show the crank did its job. If you’re after a different crank in Crimson Forest, that’s the Crimson Forest Tunnel Crank.
