Medivh was gone, yes -- but the orcs he had unleashed on Azeroth were not. At the end of the First War, the kingdom of Stormwind lay in ruin, and those that had survived the attacks fled north, to Lordaeron. Khadgar was among those that fled -- and as time passed, his magic returned to him, stronger than it had been before. He felt fine, strong and healthy as any young man of nineteen would feel, but his appearance was still that of an old man, and his youth, he feared, would never return.
The Second War ended with a tragedy -- Anduin Lothar lost his life, yet in his death, the Alliance rose up, led by Turalyon, and defeated the orcish Horde once and for all. Determined to make the defeat a permanent one, Khadgar destroyed the Dark Portal, severing the link between Azeroth and Draenor. Yet the rift between worlds remained, despite his best efforts -- and so Khadgar established Nethergarde Keep in the Blasted Lands, to keep an eye on the rift and guard against another invasion.
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