It could still work if they write in a brain tumor or possession or a curse of some kind. I kept waiting for the explanation to his madness and it never came.
Oh come on. We're talking about a guy who worked with Salamandra (untill they became a liability) in TW1 and straight up tries to murder every mage in Loc Muine if he gets a slightest pretext to do so.
He also orders Philippa's eyes removed, and watches with pleasure as she's screaming.
He was always depicted a psychopath and a sadist, with a great political prowess.
His madness just amplified, because now he has absolute power in the North and is in the middle of a war, he is technically losing.
Power and desperation both corrupt, and he was currupted as hell already.
And yeah, Shani will be in Oxenfurt expansion, just as I thought she'd be.
Now only for Fringilla in Blood and Wine, and we're all set.