You only have 10 Magic Stones? I have 69 myself. You can use the stones to unlock the high level skills that you normally cannot access. So now my new goal is to get the 2.2M mesos required for me to have level 1 Fire Demon. =) (It's something to do after hitting 30 anyway...)
You get 3 stones at each level up, so he probably used them on upgrading skills. I don't think there are any other ways to get rid of the stones atm.
Spoiler!
Woot kawaii style!
Hit 30
Spoiler!
OK so I installed this but I need a beta key. :( Or maybe I should wait until the open beta, when is that?