On a lone island located in the middle of Darrowmere Lake it sits, the remnants of the keep of Caer Darrow. The history of this isle dates all the way back to the high elves of Quel'Danas, who used the site as the location of one of many runestones the quel'dorei used. But the history of this isle has been lost in the face of far more recent history -- the history of the noble Barov family and their downfall, the history of a school dedicated to horrors the rest of Azeroth would rather forget.
During the Second War, the ancient site was invaded by the Horde, who took the runestone and broke it into pieces that were taken to create Altars of Storms. And some time after that, the Barov line came to own the property, as well as several others across Lordaeron. The Barovs, however, were not content with their mass amounts of land -- they wanted to make sure they held that land and their fortune for as long as possible. And so they struck a deal with a powerful mage, one who could easily give them all they asked and more ... for a price.
The mage's name was Kel'Thuzad.