Hierarch Kekropus:
The woman in the blue dress distributed these Tablets of Vision all over the world.
It will be very difficult to find the locations of them all, hidden as they are in the secret and dangerous places.
Even if you do find their locations, you will still require a mystical object called the Resonance Amulet in order to decipher the secret of the Tablets...
The Demon Beleth is also seeking the knowledge contained within the Tablets -- you must prevent him from acquiring it at all costs!
"I will find the Tablets before Beleth does."