For Mage

Mages, the most common of arcanists, are found all over Azeroth. They focus on magic that creates and that changes things, most often with the purpose of damaging their enemies and boosting the power of their allies.[1] Such beings can obtain a familiar, which is a normal animal that gains new powers and becomes a magical beast when summoned to service by a mage,[1] while others choose to become focused mages.[2] Mages also understand the workings of arcane energy so well that they can counter most magic with great effectiveness. An adept mage who has dedication to and natural predilection for one of the schools of specialization becomes more entrenched. At this point the mage chooses either evocation or transmutation as a preferred school, and casts spells from his chosen school. The mages of the Kirin Tor first mastered the arts of casting spells using the elements of ice and fire. Mages are also known for being able to summon elementals, usually water elementals, but can also summon air, earth and fire elementals as well.[3] The greatest mortal mage ever to live is the Naga Queen Azshara, who still lives. In fact, she may no longer be mortal.[4]
The first known mages on Azeroth were elves, before the breaking of the Well of Eternity and the Exile of the High Elves, who lived on the shores of the Well of Eternity and wielded its powers.
Early kaldorei civilization was defined by direct manipulation of magic drawn from the Well of Eternity to create and sustain their society. The constant use of the well attracted attention from Sargeras and the Burning Legion, and their coming resulted in a massive war known as the War of the Ancients. The war had grave consequences, for even though the combined might of Azeroth’s mortal races were victorious, the continent of Kalimdor was shattered, and a swirling, raging miasma of sea storms flowed into the vacant area where the Well of Eternity used to reside. This Great Sundering caused the Well’s waters to be permeated into the atmosphere and spread magic all over the world.
This event convinced the majority of night elves to reject arcane magic and embrace Malfurion Stormrage’s call for druidism. Many of the Highborne refused this lifestyle, and left in self-imposed exile to Lordaeron where they eventually founded their kingdom of Quel’Thalas and became the high elves. When their kingdom came under siege by the trolls of Zul’Aman the high elves agreed to teach one hundred humans the arts of magic in exchange for military aid from the human nation of Arathor. From these two races, the arcane arts have spread to various races all over Azeroth.