I think a sorcerer must have the power of magic and not the power of elements, i mean, let the elemental power to spirit master and give a sorcerer the power magic wich allow to slow the targhet, do transform enemy into something else, to create illusions, and of course give damage. I think a mage should do damage, but also have some tricky spells for evading, teleport, protect himself, ect...
A real mage with the power of magic should do almost everything
