They call him Betrayer. In truth, it was him who was betrayed. He was sentenced to be locked below the earth for the rest of his immortal life due to a misunderstanding. Illidan was eventually set free. When he was set free, he wanted to prove he was a Hero and not a Villain. During his mission, he found The Skull of Gul'Dan, an artifact that would curse the wicked and bless the pure. Illidan consumed the skull of Gul'Dan and became the first Demon Hunter. To this day, he remains misunderstood.