So is 12.1 more filler or do you see it fitting into this Worldsoul saga?

So Zul’jan is the main villain, because of course, and his actions cause Ula-Tek to be unleashed. We don’t know much about Ula-Tek, only that Brann theorized they could be related to the Old Gods. If the writers make some kind of connection between Ula-Tek, the Old Gods, and the Void this would be the only way they could fit this patch in with the current Light vs Void theme of Midnight. Or we just have a filler patch that is going to have no lasting impressions into The Last Titan, just like Undermine.