May want to consider removing zilean from being picked in doom bots
I don't think they are programmed to play against a zilean. When you put a bomb on the floor they will walk right into it repeatedly well chasing you. Which makes stunning them so easy and to make it easier, they walk around in a group meaning you can get 3x5 man stuns just by being chased.
It probably will just stay and get fixed the next time doom bots comes out, but makes the challenge not feel to hard.