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The key lock is one of the keys that Aline Cedrac recovers in the Shadow Island Fort in Alone in the Dark: The New Nightmare.
The New NightmareEdit
It is a small key that Aline is in the secret compartment which opened after solving the riddle of the planet, together with the bronze key and Abkanis statuette Heliopaner. With this you can open the lock to unlock a steel panel which prevented her from activating the strong lightning rods.