I'm seeing a bit of inactivity here, so I'm gonna spice things up with a faction tier list for the roles that they all would have within a zombie apocalypse. Though keep in mind that I'm not an expert in zombie apocalypse related media (I've seen like, 4 seasons of The Walking Dead and the 2 Zombie Land movies, and that's about it), so I may have missed some niches that certain factions could fit.
The zombies don't belong to Aridon or any of the other undead nexuses. And they're taking over absolutely everything, so cross-race alliance, along with big gangs is not impossible (even though in canon Arkain, it most likely would be)
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Guess I could also do one for the characters and the roles that would play within a zombie apocalypse story, though there would probably be some overlaps with my Faceless invasion list, so maybe not.
I could also make a list about which factions would end up together, but that could really go anywhere based on how the story is written.