Bladedancer (or swordsinger for that matter) can't buy any book from Lorenzo? Thay do not fit in any category.
Bladedancer does not have any skills learned with scrolls from Lorenzo. You will need 2* and 3* star skill books that drop only from command channel raid bosses and from event loot boxes or can be crafted via special craft using giran seals. I recommend to watch the market, with some patience you can buy it from other players. Good luck.
