Read the volumes of "The Schools of Arcane Magic" found in Dalaran listed below:
The Schools of Arcane Magic - Introduction
The Schools of Arcane Magic - Conjuration
The Schools of Arcane Magic - Enchantment
The Schools of Arcane Magic - Necromancy
The Schools of Arcane Magic - Abjuration
The Schools of Arcane Magic - Divination
The Schools of Arcane Magic - Illusion
The Schools of Arcane Magic - Transmutation
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