For all the prophecy and foretelling about the battle between the Dark Two and the Heroes of Brilliance, none of it was about the battle itself. Admittedly, given none of it addressed the outcome either, people focused on that more than the logistics of the fight.
But of course, all the attempts to prevent or influence the fight just led to it occurring, because predeterminism is gonna predetermine.
And the result, well you're aware.
But as for the actual fight itself?
From the outside, it looked like they just stared at each other a bunch.
But actually... Pretty much that.