I think it's a waste how that book was used by Klein as a shield mostly. This book is a virtual reality it can allow a normal human to experience what it's like to become a beyonder, act and digest potions all with almost no risk of madness as they would get out as a normal human again and get therapy.

It's perfect to groom beyonders with low risk of madness and they would've technically been pre acting so they can insta digest their potions like Klein how in his Attendant of Mysteries advancement insta digested the potion as he played the role and had the powers.

Moreover the fact that this book has chaos sea Ankewelt there's a possibility for a uniqueness to be created inside it (if he had enough power).

Just imagine someone advanced in that book to sequence 0 with his potions ready he can breeze through the whole pathway.