User blog comment:Pbnjelly/CCC4: Vis, the Elementalist/@comment-7709681-20140706015941/@comment-7709681-20140706044709

In DotA / DotA 2 you can level up 4 times each basic ability, 3 times the ultimate ability and 10 times your stats; so you can level up 25 times.

In Invoker's case, you can level up your basic abilities 7 times, and 4 times your ultimate; the crafted ultimate abilities scale with the levels of the basic abilities used to craft them.