Are sold by Julienne and Daine in Julienne's shop.
Ingredients Dictionary
Poison Dictionary
Potion Dictionary
Skill Books
Being added into your inventory, your skill levels will be enhanced. As soon as the books is removed, your skill levels will be what they used to be. You can have your companion's skill levels enhanced by adding those books into his/her inventory. These books will be never respawned. The books are sold by Melissa.
Spell Books
Being added into your inventory, your will learn spells. As soon as the books are removed, the spells taught by the books will be removed. You can have an NPC learn spells with the books. The books will provide two advantage. One is that you can easily add/remove spells. The other is that you can have your companion learn spells. The books are sold by Melissa.