Where is my reward for defeating the evil lord Teemo? :)

You got to play the game mode. There's your reward.

Although I frankly think this is the worst game mode they've ever released. It's really just not fun. Half the map and 90% of the champion roster may as well be disabled, and you're stuck in lane spamming waveclear. It's entirely a combination of communication and waveclear. That's the entire mode. That's the more significant complaint.

I like the old doom bots far, far better.