Inquisitor's Key

A key to many secrets, if not simply a key to a very hefty chest.
Overview
The 
In practical terms the 
- Treat the item as high-value: the wording implies it opens content worth seeking, so keep it in inventory rather than discarding.
- Test it against conspicuous large chests and sealed doors: the description explicitly mentions a heavy chest and numerous secrets, so obvious heavy or well-guarded containers are natural first targets.
- Use it in areas associated with lore, archives, vaults, or inquisitorial/authority themes: the name and description point toward places tied to secrets or official repositories.
- If the game signals special locks (unique keyholes, iconography matching the key, or quest prompts), prioritize trying the
Inquisitor's Key there; the description implies a match rather than a generic skeleton key.
- Preserve it until you encounter clear in-game prompts to use unique keys: since the item’s utility may be singular, applying it prematurely to a lesser container risks missing its main purpose.
Because the item’s description deliberately leaves its function open, players are encouraged to treat the 
Official description
A key to many secrets, if not simply a key to a very hefty chest.
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