Elemental Mastery

Mastery is divided into five attributes: Fire/Water/Earth/Grass/Wind.
Wizards can choose a attribute after reaching Lv 25.
When choosing an attribute, a workshop suitable for each attribute is opened, and magic items suitable for that attribute can be crafted. 
The area of expertise can be continuously changed. 
* Cost to chance attribute increases as the number of changes increases.
Each attribute has a level. If you chance attributes, your previous level will be saved, but the experience will be deleted.
Crafting slot unlocks are attributed to each attribute.
* Ex: After unlocking 5 Water specialist crafting slots, you go back to 1 slot when changing to another attribute.
* Ex: 5 slots activated when changing to Water again.