Questions about mini endings (The Witcher 3: Wild Hunt)

Roman
Postov I don’t know about Korina, but Dudu will simply be constantly in Sage and Rosemary.

dimakozhanov
And there won't be any dialogue with him as if he turns into Younger Bastard?

Roman Postov
As far as I remember, there was no special dialogue in this case.

dimakozhanov
Got it. Thank you so much)

Another question The spirit in the tree on the hill talks about Aard Zerbin. What is this place?

Roman Postov
This spirit speaks about the Bald Mountain (Aard Cerbin), you come to it according to the plot.

dimakozhanov
I thought it was something like a different dimension, otherwise she says like ordinary roads do not lead there)

Roman Postov
Korina will be in the room to the tavern where she dreamed of Geralt. Sarah will make friends with Iwasik, and the banker will move into the house. In my opinion this is a good ending. Because The goddess has nothing to do in the city, most likely all these hunters will flood him there)

Roman Postov
Well, you really can't get there except through the plot.

One more question about the endings. What if we make Ciri the empress and after the murder of Radovid kill Roche, Bianca and Thaler?