[Maturely, Kyu-Bok crinkled up his face as if to say 'augh' nonverbally, but the display was mostly a teasing one. As soon as she seemed interested in learning magic, Kyu-Boks straightened up, beaming. Sure he had never taught anyone, but it was typically the mark of a good mage to have an apprentice. While it might not get to that level with Kaoru, it could be decent practice at least to try to get a feel for it. Kyu-Bok always felt he was too meandering when it came to magic to be a teacher, but it never hurt to try it once.]

It depends on how much magic you pour into it and how well you can sustain magic. I'm pretty good at it, so if I wanted, I could have it last for decades.

[He puffed out his chest, pleased with himself, before sobering slightly.]

But sustaining magic is the most difficult type of magic to learn, let alone master. Why?