Invoker, one of the strongest hero in game if played well. I hope this guide will help you to learn a quas exort invoker, which in my opinion are the best build. It will focus on summoning 2 forge spirit on level 10 so you could start giving pressure on enemy towers and heroes soon as possible with their armor melt per attack. Once again, he's the strongest hero in game if played well, yet a squishy hero and the hardest hero in game.