Blue Crystal

"A type of "crystallite", within which dwells a mysterious power. This specimen has a higher degree of purity than normal blue specimens. It has the power to further elevate the user's knowledge and magic abilities, but sudden use of such a large crystal may damage the body, so it's necessary to acclimate the user with normal crystallite first. Because this is a very valuable item, it is difficult to obtain unless you happen to be a well-known sorcerer or a nationally recognized researcher."