Nemisis rewards?

So I'm slightly sad that I need to be 20 in order to play this mode and get the reward(s), but I'll probably grind out another 76 levels before it ends with a little time to spare.

That said, is the only reward from this mode the single icon? I've heard some people talk about other icons being earnable, and I'm going to have to work a lot harder if I need to get to 20 and play more than 1 round (e.g. if theres a reward for bulk playing similar to the poro king icon from the last event).

(Also, the single icon the FAQ mentions is only for getting through champ select and finishing the game win or lose? I wouldn't want to get through the match only to lose and discover two weeks later I won't get the icon.)