Skill Tutor Statuette

works exactly same as Crystal Ball of Knowledge

When carried in your character's backpack it will report the difficulty rating of your actions as system messages. The closer the difficulty is to "Optimal" the more likely it is your character will gain in Skills.

Difficulty Ratings

The full set of difficulty ratings are:
Difficulty     Success Chance
Too Challenging     <1%
Very Challenging     1% - 20%
Challenging     20% - 40%
Optimal     40% - 60%
Easy     60% - 80%
Very Easy     80% - 100%
Too Easy     >100%