so i looted boreas's treasue room, i got the winter ring and don't know what to do next. it's clear that the white witch is in the prison at upper right of the map. but i dont see any ways to get in there. only saw a portal in the prison but where can i find the other end of that protal??
Hint: there is a secret trap door in Hibernheim in front of a giant stone skull (somewhere in the middle of the map). You need some perception to find it. You can't go from Boreas's castle to the prison.
