There is no longer a reduction in the level at which an item can be equiped based on quality. All essential books, crafter skill level up to 9, produce items equipable at level 1. All essential books from 10 to 19 produce items equipable at level 10. The pattern continues through the tiers. Advanced books create items equipable at the n2 level: for example Advanced books for crafter levels 20 to 29 will make items equipable at level 22. Scholars are the exception as they make upgrades for the same level as their crafting level.