Draenei
The Draenei were a very intelligent race and had an affinity for magic. Using these gifts, they created an impressive society. However, the Draenei's acomplishments caught the attention of Sargeras, The Destroyer of Worlds, and he was recruiting his legion that is the Burning Crusade. He believed the Draenei would help him in his conquest of eliminating all life in the cosmos. He contacted the three most prominent leaders, Kil'jaeden, Archimonde, and Velen. He offer untold power in exchange for the loyalty to him. Although the offer sounded very tempting, Velen had a vision of the future that filled him with sick dread. Sargeras had spoken the truth: the eredar who joined the Dark Titan would indeed gain enormous power and knowledge. However, the eredar would themselves be transformed into demons. Velen saw the Legion in all its terrible might and witnessed the destruction it would wreak upon all of creation. He hastened to warn Kil'jaeden and Archimonde, but they dismissed his concerns, for they had been enticed by Sargeras' promises. They gave Sargeras their allegiance and were transformed into colossal beings of depthless evil.