Original Dark Portal is destroyed

Full History

The Dark Portal had transformed two worlds by allowing Gul'dan's Horde to invade Azeroth. From its position in the Black Morass, orc armies had spread war through Stormwind and north into the lands of the Alliance. The coalition's eventual victory over Orgrim Doomhammer gave its leaders a chance to address the passage through which the invasion had begun. Leaving it open would have risked a renewal of the conflict by forces still active on Draenor.

Khadgar, the mage who had once studied under Medivh, understood more than most survivors about the gateway's origins. His experience of the corrupted Guardian and the magic surrounding the Portal made him central to the effort to sever the connection. The original Dark Portal was destroyed after the Second War, ending the open route that had served the Horde's invasion. The act was both a military precaution and a symbolic end to the passage that had cost Stormwind its kingdom.

The victory did not eliminate the orcs already in Azeroth. Many remained in camps under Alliance control, while others escaped or held distant positions. Nor did it heal Draenor or remove the warlock leadership still active there. The separation of the worlds was therefore temporary in historical effect, even if its immediate purpose was defensive.

Ner'zhul and the remaining Horde would later reopen the way in pursuit of magical artifacts and new portals. The Alliance responded by sending an expedition through the connection to confront the threat at its source. Khadgar's efforts to close the passage during Draenor's destruction were distinct from his earlier dismantling of the original Portal. Both acts belonged to the attempt to defend Azeroth from consequences that began with Medivh's corruption and the first opening between worlds.