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You examine the lever and quickly discover why it will not open the secret panel. The locking mechanism that it operates is clogged by dust and grime that has accumulated with centuries of neglect. You set about clearing out this debris, but it proves to be a long and difficult task. Unless you possess the Discipline of Grand Huntmastery, while you are working on the lock you must eat a Meal or lose 3 ENDURANCE points.
At length your perseverance is rewarded when you clear away the last of the grit and pull the lever for a second time.