Since Peryite is some kind of Daedric Dragon Prince it is really interesting to go to his Realm and then you are on the side of The Dragons
Since it is also a Dragon Invasion i think a Peryite Realm Expansion should really fit the Dragon Invasion in Skyrim Because he is also some kind of Dragon
I would like to go to his Realm
it's Called Peryite's Pit or The Dragon Pit
Peryite's Pits(Dragon Pit)are the lowest reaches of Oblivion, resembling a fiery and gloomy hell (much like Mehrunes Dagon's) in which Daedra roam.
I am all for everything Daedrc, HOWEVER, I would be happy with explorable pockets of the various Daedric realms, akin to the pockets we got of The Deadlands (versus the full realm experience of Shivering Isles). . . and IF it came down to a A, B or C but not all three situation. . . there are other realms I would rather visit than Peryites, in so much as it might indeed be too much like The Deadlands, of which I have already seen plenty. The only thing about Peryite's province that really lends itself, aside from him being a dragon in form, is the fact that, being taskmaster to many lesser daedra, we might get to see more of the sub-races.