Burx was a chief warrior in the Horde, who unfortunately was also part of the Burning Blade. Burx had grown up as a slave to humans during the Lethargy of the Orcs, and had been abused by them every day of his life until his liberation by Thrall--Burx, therefore, despised all humans. His prejudice made it easy for the demon Zmodlor to recruit him into the Burning Blade with promises that the cult would try to kill every human on Kalimdor (in reality Zmodlor hoped to cause the humans and orcs to exterminate each other and had recruited many humans into another Burning Blade cult, making similar promises to them about killing all of the orcs).