Item/Mineral that negates/cancels Magic in Final Fantasy Universe(s) ??

Is your project (Flashback) based on any official information, or is it all unofficial/fabricated that you created yourself? It's really cool, I'm just wondering where all this prequel stuff came from.

The only canon info about the event prior to the game script that I know of are in the Settei Shiryou He guide book.

Here's the FF Wiki entry about them: http://finalfantasy.wikia.com/wiki/Final...I/Timeline