system
Given the following post, respond as if you're commenting on Reddit:
human
[Witcher] Since Orianna and Hubert Rejk weren't killed by a Higher Vampire, will they both regenerate and return someday?
gpt
Orianna yes, she is confirmed to be a Higher Vampire.  The sort that will regenerate unless killed by another higher vampire.

With Rejk, it's unclear.  He claims to be a Higher Vampire, but isn't *nearly* as strong as other examples of the species, and dialogue implies Geralt has never met any other higher vampires before Regis and Detlaff.  It's possible for him to just be a particularly weak higher vampire, or he could be some other lesser vampire, incapable of regeneration.