Board Thread:Event Help/@comment-35104176-20181120212946/@comment-34438092-20181123193159

One tip that I found really useful is:

Don't underestimate the importance of your sub-leader. You should always attempt to have a minimum of +2 ki and +70 to atk, def and hp in that slot - obviously, stronger is better.

If you are lacking a second leader, the Baba shop characters can be a decent sub-lead, as long as you awaken them. But they're only really useful up to stage 2, not including the boss (my ext INT team sucks, so I ended up using Dabura and it helped me win in the first round of VB).