Etna's Diary
In the castle there are two hidden switches, one is near the skull on the counter of the Rosenqueen shops and the other is behind the throne. To gain access to Etna's diary which is in the middle of the intermediate hallway between the throne room and shops you have to flip both of the switches.
To be rewarded with a Testament item in the final chapter you have to visit this area during each of the chapters to the final.
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