Final Build Example
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.
To sum it up fast.
Use your E to farm. Hide in a bush, and when a person comes up to you QWER them, then wait until they die. If they get away chase with your Cancer Puppies. Go Barrier/Flash, if you want to spread hate. Flash/ignite because you can ignite during your ult.
In TeamFights Stay in back line and QW People, your ult and E aren't to helpful.
-Mainly single-target damage
-Spreading cancer with all of your enemies' salt
-Boring during the laning phase