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The disease originated from Hakkar the Soulflayer -- the boss of the very initial 20-player raid Blizzard released. Hakkar would cast Corrupted Blood on players and it might damage them for approximately ten seconds. Players would spread the effect to wow classic gold others when they got too close to those infected. Following the 10 seconds were done, or players finished the boss battle, the harmful impact was supposed to end. Only it didn't.

A programming supervision enabled the debuff to disperse beyond the website of the Hakkar boss struggle and to the world at large. Much like rats fueled the Bubonic Plague, characters' trained animals spurred the Corrupted Blood outbreak. Hunter characters may summon and discount pets to fight in their side at will. Once ignored, all the effects on the pets have been paused until it is called back out again. In effect, the pets would contract Corrupted Blood during the boss fight, disappear and then display the symptoms again elsewhere in the world map when they were summoned. There it would spread to other players and pets that came in contact with them.

Cities such as the dwarven town Ironforge and orc town Orgrimmar were overrun in hours. Non-playable characters, who could not die due to particular coding, could also catch the effect, meaning any participant who passed them could receive Corrupted Blood.

Once word got out, players searched frantically for news about what was going on.

"The entire world chat would burst any time a town dropped," says Nadia Heller, an ex-World of Warcraft player whose character lived through the episode. "We kept a close attention not just on our guild conversation but on earth chat as well to buy wow gold classic see where not to go. We did not need to grab it."