Sargeras was killed by the human witch Ai Govin, but before he died, he possessed an evil soul with Ai Govin, who gave birth to his son Medivh. However, Medivh's ability was sealed by the night elves and turned into a bird, and then Medivh woke up in time, making an important contribution to the future resistance of the Burning Legion to the night, orcs and Terrans.