What is disconcerting to me is the lack of a villain beyond Golbez. If this is it for Golbez, his final showdown in this trial, we have no rumored or secret villain teased for the upcoming expansion.

This leads me to believe that Golbez is another villain in a mask; meaning that defeating him in combat will only have him reveal his identity and not be the defeat we expect.

As evidence to consider, all of the other void characters have had a well thought out backstory (even if some of it is side content). But we've got nothing on Golbez except he recruited the 4 fiends. I'm going to venture further and say there has to be an association with Golbez and the Countermemoria war.