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Hakkar would cast Corrupted Blood on players and it would damage them for approximately ten seconds. Players would spread the impact to others if they got too close to those infected. Following the 10 seconds were done, or players completed the boss battle, the damaging effect was supposed to finish. Only it didn't.
A programming supervision enabled the debuff to spread beyond the site of the Hakkar boss struggle and into the world at large. Hunter characters may summon and discount pets to fight at their side at will. Once dismissed, all the effects on the pets are paused until it is known as back out again. In effect, the pets could contract Corrupted Blood through the boss fight, vanish 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 city Ironforge and orc city Orgrimmar were overrun within hours. Non-playable characters, who could not die as a result of cheap classic gold wow particular coding, would also catch the impact, meaning any participant who passed by them could receive Corrupted Blood.