Gul'Dan Betrayas Doomhammer and Zul'jin | Tides of Darkness Campaign

Gul'dan was allowed to lead an entire clan, the Stormreavers, in addition to his loyal servants among the Twilight's Hammer. (It's telling that, with Gul'dan dead, only the Old Gods could command the loyalty of the Twilight's.) And yes, in the end Gul'dan betrayed Doomhammer and the Horde, as everyone always knew he would.
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