I like it so far, but further explain the extra spell slots, it's a bit vague. Also, the Area Control ability as it stands says; "Your lightning bolt is now a cone" Or hell, a burst! Please, strap on some radius steps and ranges that go along with it, for example a 120-ft line to 20-ft burst, or 60-ft cone for example. And reversed obviously. This is just an example ofcourse.

Also, please consider that you need to be clear in both the text as well as the table.