Made a quick and clear image of Invoker spells. I use this on my 2nd monitor as I play dota2. Not sure if people struggle with Invoker like I do, but I
Invoker Training - Latest version for Android - Download APK
I made an Invoker trainer game : r/DotA2
Invoker Pro Trainer for Android - Download | Cafe Bazaar
Build Dota 2 Invoker Items and Skills, Pro Player Style!