Keyleth, Vex’ahlia de Rolo, and Allura Vysoren suggest that Vox Machina lead the assault on the fortress as a distraction with the Mighty Nein presumably the team tasked to take on the Weave Mind, leaving Bells Hells to go after Ludinus as these attacks all happen simultaneously. While they still have to pitch this idea to the collective at large, Keyleth makes it pretty clear that this is what she plans to do, whether they have support from others or not.
In the Beacon exclusive Critical Role Cooldown companion episode, Matt reveals that should this plan come to fruition, it would likely see the cast step back into the shoes of their past characters for each stage of the attack. Reminiscent of the Avengers: Endgame portal scene, we’d get to see the cast play as Vox Machina, the Mighty Nein, and Bells Hells in what would technically be the same fight, though spread out over their respective targets.
This kind of crossover event is something that fans have been speculating about ever since Campaign 3 revealed how closely it was tied to the other two campaigns. The cast has already revisited the Mighty Nein during this time period in the live show Echoes of the Solstice, but that was technically separate from the campaign. In this case, it seems more likely that these battles would simply be asides in the general campaign just as the Crown Keepers and Downfall arcs were.
The Bells Hells campaign continues to find ways to make this story exciting both for us viewers and the cast as players. What better way to begin the potential final chapter of this campaign than to take us and the cast back to the characters that started this all for one epic battle. The fates of Exandria, Ruidus, and the Gods hang in the balance, and it looks like it’ll be up to these three merry bands of misfits to save them all.