Time Splicing of the Dark Portal

The Time Splicing of the Dark Portal was done by Garrosh Hellscream to bridge present-day Azeroth with the Draenor of 35 years prior.

Reasoning of the Time Splice

Garrosh connected the Dark Portal to an alternate parallel universe, bridging his own universe with that of a parallel universe whose orcs had not yet drunk Magtheridon's blood. Thus he did not alter any history of his universe.

The official Blizzard reasoning behind the Time Splice. (Source: WoW General Forums)
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