Ahhhhhhhhhhh i remember when I was looking for news on Materia in came up with loads of final fantasy things....so i am guessing Materia is in final fantasy somewhere.
OK using the power of google and wikipedia that guy cloud had something to do with black materia...no idea what it is all about.
Worn Carillon. Because: "A carillon is a musical instrument composed of at least 23 carillon bells, arranged in chromatic sequence, so tuned as to produce concordant harmony when many bells are sounded together. It is played from a keyboard that allows expression through variation of touch. The keys are struck with the half-closed hand. In addition, the larger bells are connected to foot pedals."