Hi there, I'm also a Berserk fan (my fav and only), but you sure it could work with The Witcher? I mean that sword supposed to be almost as big as a man, and the movements Geralt makes with the sword wouldn't make sense with such big sword, but I don't know about modes so I think someone should experiment it might turn out to be pretty cool
As you can see in the game, besides fantasy element, the witcher universe is realistic and believable. Dragonslater is everything but believable and realistic. Nobody could lift such sword.This sword doesn't fit in the game.