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.
I know this like a weird build but it seems to be the only way i can get a good game from her i have played her twice now with this build and got no less then 10 kills
If you play her abit like you would play Urgot seems to get the best results use your poison as a way to make sure they die rather then your main source of DPS.
Early game Cass is realllllly squishy so i try to stay out of fights and farm as much as i can until i can get my boots and my 1st major item after concentrating on my Q and my E. Using Q to get there health down and E + physical attack to kill.
Mid game with your 1st 2 big items you should really be able to do some damage try to stay at the back of team fights tho as you are really squishy using your ultimate where there are multiple enemies to get the best effect. Also with tanks running away keep putting your Q and W skill in front of them to get the most stacks of poison on them while hitting with E and physical attacks.
Because of this lack of survivability i use flash and ghost in order to get away but on occasion to keep up with tanks.
Overall with decent AP and Decent AD i believe you will get the most out of this champ.
Please just try this build before you write it off.