Posted it in the showcase thread, but idea:

Pandemonium is appearing in XIV as the 8-man raids set after Endwalker's MSQ. In II, after dying Emperor Mateus Palamecia returns from Hell as the Dark Emperor, dragging Pandemonium with him... from under the ground.

While Endwalker is said to conclude the Zodiark / Hydaelyn saga, the idea there could be some lingering fallout from Danny Boy's plan isn't off the table... and given Lahabrea, one of Zodiark's most fervent (not) supporters is making a comeback there, I can't help but wonder if there's a connection there.