Crystal Ball of Knowledge
It has the same functionality as the Skill Tutor Statuette.
Note that the difficulty ratings are gathered by comparing the message with the crafting chances.
If you get the the too challenging or too easy message you will have zero chance to gain skill from that item.
Optimal means what you are doing gives you your best chance for skill gain. Every other message falls somewhere between.
|Very Challenging||1% - 20%|
|Challenging||20% - 40%|
|Optimal||40% - 60%|
|Easy||60% - 80%|
|Very Easy||80% - 100%|