I'm unaware of the book lore, is there even a single precedent for an adult to undergo the Trial? In the lore of the games, the only example we have of witchers' secrets being used on adults were the Salamandra mutant soldiers from Witcher 1. Oh hey, maybe I just wrote the lore for Ciri being a butterface now...! You're welcome CDP.

Intuitively it feels like the reason they take witchers as kids is because the trial only works on kids, when it works at all. Genetically altering an adult, who has already undergone all their physical development, doesn't sound like it would make the trial easier, instead it sounds impossible.

If witcher schools could witcherfy adults, even adults with magic capabilities, there should be no good explanation for witchers dying out.

EDIT: also, since it just occurred to me - are we supposed to celebrate the fact that she's sterile now ('And That's A Good Thing...!')? Or will they dodge that uncomfortable implication with convenient plot armour or strategic non-discussion?

I'm unaware of the book lore, is there even a single precedent for an adult to undergo the Trial? In the lore of the games, the only example we have of witchers' secrets being used on adults were the Salamandra mutant soldiers from Witcher 1. Oh hey, maybe I just wrote the lore for Ciri being a butterface now...! You're welcome CDP.

Intuitively it feels like the reason they take witchers as kids is because the trial only works on kids, when it works at all. Genetically altering an adult, who has already undergone all their physical development, doesn't sound like it would make the trial easier, instead it sounds impossible.

If witcher schools could witcherfy adults, even adults with magic capabilities, there should be no good explanation for witchers dying out.