User blog comment:JmLyan/Fortuna, the Lady of Luck/@comment-26044269-20150612034312

O silly billy, you always make these kinds of mistakes; E doesn't have a cost type.

Also personally not seeing why passive scales off AP; Fortuna would benefit a lot more from crit/AD items than AP items. If your intentions were to give some incentive to build AP on Fortuna, then the scalings on passive may be able to use some increasing so that there is a clear difference between the advantages gained from building AD and AP, because as of now, the only AP items I can think of which would actually benefit Fortuna more than other crit/AD items would be Void Staff and Luden's Echo.