Khadgar destroyed the Portal on the side of Draenor to prevent harm to Azeroth, trapping the remaining Alliance forces beyond the Dark Portal in the dying land of Draenor. The violent energies began to destroy Draenor and also threatened Azeroth. Ner'zhul managed to open portals to the Twisting Nether and escaped through one of the new Portals. While the Alliance army and navy only barely held out, Khadgar managed to acquire the items with help from the Laughing Skull Clan. They razed the Shadowmoon Citadel, seat of Ner'zhul's Shadow Council. 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 The Alliance itself had been splintered after the Second War and Gilneas and Stromgarde had withdrawn their support.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 the shaman 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. The expansion was later released alongside Tides of Darkness for the PlayStation and Sega Saturn in 1997 as Warcraft II: The Dark Saga, and was included in the Warcraft II: Edition for Windows PC and Macintosh in 1999. It requires the full version of the original game to run and adds new story campaigns and multiplayer maps. It was developed by Blizzard Entertainment and Cyberlore Studios, and published by Blizzard in North America and Europe in 1996.

Warcraft II: Beyond the Dark Portal is an expansion pack for the real-time strategy video game Warcraft II: Tides of Darkness for MS-DOS, Microsoft Windows and Macintosh.

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