Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This build is created because a lot of people understimate Cassiopeia and iÂ´ll try to change their mind about it. So the basic of this build is basicly to make ap with damage item so you can do a lor of damage at once after hit your ultimate.