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.
are you seriously still playing ap kat? her ult works better off ad now, with close to 600 ad your ult does the same damage as some one with 800 ap, catch my drift :P, plus with this build you hit over 500 and more than half the time it crits for 1250 damage not that you are an auto attacker, thats why there is no attack speed