Sargeras is the creator and leader of the Burning Legion. Sargeras was once a vanir titan, a Champion of the Pantheon chosen to defend the worlds they had created.
Sargeras has changed over the millennia. While he once served his race as guardian and protector, he is now the titans' worst enemy. Sargeras works to undo what the titans have strived for ages to achieve. He is now the master of all that is evil and demonic. Lesser beings quake and flee in his presence.