After doing one of the quests... Either in the story or to unlock CT I got three Grade 5 Carbonized Matter? What the heck is it used for? I know you need Grade 4 to meld T4 materia. Are there some hidden T5 materia we don't know about? There's currently no way to obtain any more other than buying it off players, and I haven't found a use for it other than melding stuff you could use lower ranked Matter for.