I wouldn't be surprised if one of the Pandaemonium plot-points would be us fighting whatever creatures in there that have been created to somehow work a way to make Lahabrea "immortal", raising him over and over and all that.

Although in my opinion, I think we have had enough of him. Not that he is a bad character, I just think there isn't a need to add more to him really, and Pandaemonium being us dealing with his legacy would work just fine.