Quote Originally Posted by wicked-one View Post
Okay, that´s really not what I wanted to hear... well, at least I know why I saved so much gil ^^


I was guessing that the more Grade I you do, the lower the Chance until you HAVE to use higher grades, instead of completely lock the slot when enough is fused in... but well okay, results the same...
No you can only use one Grade of Materia ata a time. Dependent upon the number of infuses on that stat.