
Khadgar needed the spellbook of Medivh and the Skull of Gul'dan to accomplish it. The Alliance gained a foothold and made preparations to seal the rift forever while the Orcs reorganized. Before being pushed back, Ner'zhul managed to steal the spellbook of Medivh which was needed to create new Portals. The Horde was beaten back and Khadgar decided to take the initiative to push through the Portal into the Orcs' homeland. The arch-mage Khadgar summoned heroes of Azeroth, Alleria Windrunner, Danath Trollbane, Turalyon and Kurdran Wildhammer to rally the forces of the Alliance. The Alliance itself had been splintered after the Second War and Gilneas and Stromgarde had withdrawn their support.

The Orcs, now under the leadership of Ner'zhul, staged a new invasion of Azeroth and overwhelmed the citadel of Nethergarde, which guarded the remnants of the portal. The plot of Beyond the Dark Portal takes place after the events of Warcraft II: Tides of Darkness.
