Hi ya Ryastar, some answers for your points, I was suggesting a global reset so will ignore 1 & 4,
2: A small problem, both die and disappear would be ok aslong as you state it on the button.
3: The reasonable thing would be to downgrade that spell if you didn't meet the prerequisate and refund the chrystals. In theme with the rest of the thread you focus on that it would be the toughest thing ever to keep track of something so simple as nr of chrystals/runes spent.

I allready mentioned some problems with the idea in a previous reply but I don't think the things you added posed any additional problems.