As always, thanks for all your input everyone! The third challenge was a little difficult to obtain. We had a game with a really quiet lobby, as players kept continuing to disjoin, so we were doing some waiting around. And I had to do my third challenge, and it just so happened we were in the Colossal Fossil map. So I got my brother to run into the minecart 10 times so that I could deny the orbs that dropped from it, that's how I got my third challenge... 😇🙂!
For the event itself, it's quite fun. You get to level up a bit of each character. You get to try different playstyles. You possibly get to use Wizard even if you don't own him yet (if that is possible). It's a great twist of Vanquish Confirmed. I must agree with the third challenge and its difficulty, I did "cheese" that challenge so must agree it's difficult, however for this challenge you can deny orbs as well as collect orbs from vanquished opponents.
Something weird I noticed about this event (and other rando ones) is that me and my brother always get spawned as the same character at the start of each match, there has never been a time where this has not happened. Is that a split-screen thing I wonder?
Again, thanks for all your input! 😃