User blog comment:FairyRaven/One-time-only Spells/@comment-3271746-20120714151422

On Uranometria: I think this spell is only for CS Mages, since it summons the power of the stars and constellations and stuff, so Hibiki can't use it. This magic probably requires a very strong and intimate connection to the stars and constellations and the spirits that represent them. The reason why Hibiki had it in his archive in the first place is very mysterious. I think it is because he either 'uploaded' or planned to 'upload' it as a gift to his then girlfriend, Karen.

On Fairy Glitter: I really don't know how to define or describe the strength of Fairy Glitter. All I know is that it is strong. It is possible that one of the drawbacks of FG is that it is supposed to be a one-time only spell, which makes it rare and all the more valuable. FG did not make Cana's magic power stronger. It did however, as Mavis also said, proved that Cana has high magic power required to properly cast the spell. And we can't really compare Jura with that spell. Jura relied on his actual Magic power, while Cana relied on an already extremely powerful spell that just required a high magic power that must not exactly be of wizard saint-level magic power.

On Mavis' power-lending: That is one of the few mysteries only Mashima can answer. Besides, it's not really so surprising considering the fact that she peed. =))))))))