Welcome to Annwn!
“Welcome all, ye who enter here.”
Hell, the Abyss, and Abaddon (Hades?) have all combined into one singular plane, called by the affected, Annwn (Ah-noon.)
The multiverse is in shambles, even the Heavens are at risk of colliding with the Material Plane and further still, as the Hellscape loses more and more control with no end in sight.
With big players like Asmodeus, the Four Horsemen, the Abyssal Lords, and even Death incarnate involved, it’s going to take a determined party to part the planes into balance once again.