Questions about castle greyhawk, spoiler alert if you have not run epiditeion

[Nessa Ellenesse]

At the end of Expedition to Castle Greyhawk, the castle becomes unhinged from reality. Has anyone seen it on Kyrnn, Toril, Ebberon or Kalamar?

[Eisfalken]

At the end of Expedition to Castle Greyhawk, the castle becomes unhinged from reality. Has anyone seen it on Kyrnn, Toril, Ebberon or Kalamar?

Officially? Nope. Castle Greyhawk becoming "unhinged" just means DMs can run it in other settings if they want, but there is no "official" anything saying that that has ever happened.

Why would it even matter? If you're the DM, just run the thing in any setting you want. Swap out some of the names for those more appropriate to the setting in question, maybe change out Iuz to some other being, etc.