Jewel Voice Broadcast

The "Jewel Voice Broadcast" is a Artifact from the lost ancient magic technology, commonly used as a message broadcasting system to the general public.

Over View
The true nature of the "Jewel" is unknown as its from the Lost Ancient Civilization, and the only place to get them is from a "Dungeon".

The only information that have been uncovered regarding them is that the "Jewel" are actually the "Dungeon Core", and that utilizing Water & Wind Elemental Magic on them causes them to take in the scenery around them and project through the receivers. Rest of its functions still remain a mystery.