User blog comment:Pbnjelly/CCC4: Vis, the Elementalist/@comment-7709681-20140706015941/@comment-7709681-20140706030821

Understand that Invoker doesn't gain stats per level, instead he has his Q, W and E to gain stats per level of each ability, which allows him to manipulate his own development to the point of being able to play any role he wants. The other function of them is to stack them to formulate your ultimate abilities.