Night Elf

Night elves (or kaldorei, for "Children of the Stars" in Darnassian), are a powerful and mystical race whose origins extend back to ancient times. These then-immortal beings were among the first to study magic and let it loose throughout the world nearly ten thousand years before the First War. The founders of a magical and advanced civilization which at its peak spanned the breadth of ancient Kalimdor, the night elves came into a horrific conflict with the Burning Legion but achieved a Pyrrhic victory that ended in the Great Sundering, turning Kalimdor's landmass into the continents of the present age. The devastation wrought by the chain of events birthed in conceit caused a wholesale shift in direction. The night elves abandoned the use of arcane magic, fearing its use would draw the Burning Legion back to their world. The main survivors of the Sundering crafted a radically different society centered around druidism, the harmony with the natural world and its denizens.

The far-reaching and ancient legacy of the night elves shaped them into a race of very self-sufficient and self-conscious individuals, who often display strong streaks of isolationism. The night elves ended a long period of seclusion referred to as theLong Vigil in the aftermath of the Third War, standing with refugees from the Eastern Kingdoms during the Battle of Mount Hyjal. They then began to associate themselves with the Alliance in response to the Horde's presence in Ashenvale.

In When the Cold Breeze Blows Away, when Azeroth helped them a lot of new advance generations, they eventually joined the Grand Alliance due to have their advance generation, a peace treaty and even have modern technology.

Not only protect Azeroth, they also have their own new technology and new tacticals while they may be protecting their homelands, their forests and even their natures from Coalition of the Red Star.