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Hakkar would cast Corrupted Blood on gamers and it would damage them for about 10 seconds. Players would disperse the impact to others when they got too near those infected. Following the 10 seconds were done, or players completed the boss battle, the damaging effect was supposed to finish. Only it did not.

A programming oversight enabled the debuff to disperse beyond the website of this Hakkar boss struggle and to the world at large. Much like rats fueled the Bubonic Plague, personalities' trained animals spurred the Corrupted Blood outbreak. Hunter characters may summon and discount pets to fight in their side at will. Once dismissed, all of the effects on the pets are paused until it's known as back . In consequence, the pets could contract Corrupted Blood through the boss fight, vanish and then exhibit the symptoms elsewhere in the world map when they were again summoned. There it might spread to other pets and players which came in contact with them.

Cities such as the dwarven city Ironforge and orc city Orgrimmar were overrun in hours. Non-playable personalities, who couldn't die due to special coding, would also catch the impact, meaning any participant who passed them could get Corrupted Blood.

After word got out, players searched frantically for safest place to buy wow gold information about what was going on.