While outside Vritanis, the Skull Knight revealed that her mental state may be cured by the Elvish queen Hanafuku while cryptically warns Guts that "What (Casca) wishes for may not be what (Guts) wishes for".
While outside Vritanis, the Skull Knight revealed that her mental state may be cured at their final destination, Elfhelm, by the King of the Flower Storm. But the Skull Knight also cryptically warns Guts that "What (Casca) wishes for may not be what (Guts) wishes for".