Fog frequency

Exploration Stage: Foggy Oasis
From: Abbot Paku
Description: I have another idea as to where the girl's voice in Lucas' head is coming from. If we had a vibration sensor, we would be able to find out the sound waves of that voice. The problem is that vibration sensors are very rare items... can you find one?
Completed: I can't believe it! You have found a vibration sensor! With this device, we can now examine the voices in Lucas' head. So let's get right to it and put it close to Lucas' temple... it's strange. It seems that the voices are coming from... everywhere. I have never seen anything like it.