Nothing happened... The movie can be summed up by watching the last 5 minutes of the last movie. What a disappointment. I guess they are making another one, because nothing about this move says epic battle between Dumbledore and Grindelwald...
I also have questions that can't be answer because the plot was just so bad.
Why choose a no-mag to be part of the group and why did they give him a wand? I thought something would come of that... but no.
Why did everyone support Grindelwald and his ideas? Is most of the magic community against muggles? I didnโt see that build up.
Why did the wizarding world have to elect a new leader, and was that for the whole world? That just kind of happened.
What was Credence's role in this story and how does it fit in with Aberforth's story from the books... Or even the movies?
What happened to Nagini, is she nolonger important to the stories?
On top of all of this, I just found the movie boring. It was just a CGI eye show without a lot of substance in my opinion.
And Dumbledore's secret (the only one it could be referring too) ... Not really a secret after the last few movies.