Mastery Books are a type of use item. For nearly all classes, many of the 4th Job skills can initially only be trained to level 10 with SP. However by using Mastery Books, the player can raise the maximum allowed level of their skills.
In pre-Big Bang versions mastery books were very specific and some were better than others, making the odds of obtaining the right one very slim. However as of MapleStory: RED a new type of Mastery Book was introduced. These Mastery Books when used allow you to increase the max trainable level of a skill from 10 to 20, and then from 20 to 30 (if the skill's max level allows for it to go that high).
| Picture and Name | Description | Effects |
|---|---|---|
 Mastery Book 20 | A mysterious Mastery Book. Double-click it to raise the mastery level of a desired skill. | Master Level of the chosen skill increased from 10 to 20 at a 100% rate |
 Mastery Book 30 | A mysterious Mastery Book. Double-click it to raise the mastery level of a desired skill. | Master Level of the chosen skill increased from 20 to 30 at a 100% rate |
 Luden's Mastery Book | A training guide from Luden, the Lion King's loyal knight. Grants the user a Mastery Book to enhance their skills. | Lets you choose between Mastery Book 20 or Mastery Book 30 |
Silent Crusade Mastery Book | Secret book for true Silent Crusaders. Double-click to obtain a Mastery Book for your character. | Lets you choose between Mastery Book 20 or Mastery Book 30 |
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