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.
About me and why you should listen
Hey guys just an Illaoi main here I have 3rd most Champion Mastery point with her in the world so I'm not a scrub. look me if you don't believe me JimboJangles72. Go with the 3 core items I get mana first and like to go back with 1000 or more gold so I get get the sheen and boots. Iceborn,maw,Death,Spirt,Omen,Deadman is the buid I like too 1v5 with. If heavy ap swith gage with maw. You can mix it up, Illaoi is one of the only champs in game that can 1v5 so dont be scared. Just go with the core items and experiment from there. Have fun slapping kids.
P.S ALWAYS ALWAYS ALWAYS pull their spirt before you ult and they will feel the true power of her god