Light: Warmth inside slowly regenerates-heals units at 3+X HP/sec
Dark: Heat insides slowly burns-damages units at 3+X HP/sec
Doesn't that kinda mean it does 0 damage? Or do you mean by Light and Dark the effects it has in Day/Night?
Each spellcaster will have an option to develop into either a dark magician or light magician (jedi?:P). This is a choice which player will have to make once their spellcaster is created. Once spellcaster learns his/her 3rd spell player will also have to decide if he wants to specialize in one school or multiple schools, as most spellcasters (not counting Elfs) will only learn up to 8 spells (and each school takes 6). .