The Schools of Arcane Magic - Enchantment is a book found in Dalaran.
Enchantment is the process of imbuing an object - or person - with magical power. Some enchantments are temporary, while others can offer permanent benefits. Enchanting can be difficult to learn, but it is one of the most potentially lucrative forms of magic to study. I highly encourage the study of enchanting, as it is one of the studies of magic that is least likely to culminate in my own destruction.
Disenchanting is the process of dispelling or removing magic. The dispel magic spell is among the most important in a mage's arsenal, as it can potentially reverse the catastrophic effects of a misfired spell. It is also possible to permanently disenchant a magical item. This produces a unique form of crystallized mana that can be used in the process of imbuing another item with magical abilities. While this can get expensive, it is often one of the best ways for a young mage to study the enchanting process.
While he has already previously been mentioned for his skill in abjuration, Prince Kael'thas Sunstrider is also considered one of the foremost masters of enchanting in our time. He has not only mastered the creation of potent magical weapons, but the prince has also learned to manipulate these objects remotely, allowing them to fight on their own. This can quickly allow the prince to fight as if he was defended by several skilled guardians even when he is completely by himself. A potent defense, indeed.