Born on Draenor, the homeworld of the orcs, Gul'dan was once a member of the mystical Shadowmoon clan. Utterly obsessed with obtaining power, Gul'dan agreed to a secret alliance with the Burning Legion, a destructive army from beyond the stars. He drank demon blood and altered the fate of his people forever. The blood transformed his visage into something hideous, bent and twisted by demonic energies. With his lieutenants, he formed the nefarious Shadow Council.
Gul'dan intended to subjugate the orcs to the Burning Legion by convincing the legendary warlord Grommash Hellscream to drink demon blood as well. On the eve of victory, Gul'dan's plan crumbled. Grommash, advised by a strange prophet, revealed the warlock's treachery to all the clans. Instead of yielding control to the Burning Legion, Grommash forged an Iron Horde free to conquer Draenor through its own might. Gul'dan was made a prisoner. Yet chains will certainly not keep this delegate of the demons contained for long.