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.
Threats to Illaoi with this build
|Ashe||Adcs pose a little threat but not major threat, especially if you get thornmail|
Start with Gromp, leash is not necessarily needed as you can get two tentacles up while waiting for minions to spawn, which is only useful if you actually do start Harsh Lesson. Move to wolves for a little more exp and then get scuttler for more exp and vision. Take blue and you should be level 3. Rest is up to you, but moving to Krugs is highly recommended before taking red. Remember to wait a bit for your passive to spawn a tentacle before fighting a camp, it can mean the difference between life and an embarrasing execution