Hierarch Kekropus:
This will be a very dangerous and difficult journey.
But from what I have seen of you thus far, I think you are up to the challenge.
...
As I have already said, you will need an object called the Resonance Amulet in order to communicate with the Tablet of Vision.
This was created in order to prevent the knowledge of the Tablet from falling into the wrong hands.
According to my research, the first Resonance Amulet is in the possession of Magister Justin in Goddard Castle Town. Go find him.
Be warned, though: Beleth's minions may also be seeking the Resonance Amulet and may try to stop you.