The dog whistle is found in the second floor east study of the Mansion. It can be used on the West terrace to call two dogs, one of which is carrying a replica of the armor key in its collar. After you examin the collar it will reveal the coin. Then if you examin the coin it will transform into Armor Key Imitation. Armor Key is resting on a pedestal in a room guarded by a trap. If you pull the key from the pedestal, a trap with rotating blades on a shield will activate. To bypass use Imitation of a Key on the pedestal.
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