They can also be socketed with special gems, as well as slowly level up over time based on usage.
These are not the final spells to be implemented in Frost and Flame, as with everything else in the game they are subject to change. And they most likely will over time.
Once I have implemented some actual game play, then these can be balanced and changed to better fit the game.
But it is nice to finally have a visible and interactive skill book.
It took so long to get spells re-implemented due to all the underlying work that I was busy doing on the UI these past months.