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Mannoroth the Destructor was a Pit Lord whose ruthlessness and vile cunning made him quickly become one of the favoured lieutenants of his dark masters, Archimonde and Kil'jaeden, the Eredar champions of the Burning Legion.

Mannoroth was among the demons that made the excursion into Kalimdor many centuries ago during the War of the Ancients. Though he battled with brutal ferocity and millions fell at his four feet, he was defeated by Cenarius and his followers and sent back into the Twisting Nether as the Well of Eternity was destroyed.

Mannoroth made his mark upon the orcs, however, far back in Draenor. Many years before the Dark Portal was first formed, Mannoroth, under instruction by Archimonde, formed a plan to put the orcs under the thumb of the Burning Legion. They would serve as harbingers of chaos, wiping out any potential resistance when the Legion arrived. With the help of Gul'dan, the chieftains of the clans drank Mannoroth's chaotic blood. They were engulfed by a demonic bloodlust that wiped out the Draenei and damned the orcs forever.

However, after the Dark Portal was opened and the orcs engaged the humans over the course of two wars, they were unexpectedly defeated and routed by the humans. The orcs, and in turn, Mannoroth, had failed. Mannoroth, painfully aware of this fact, made plans to have his vengeance.

Finally, Archimonde was summoned by the lich, Kel'Thuzad, to the world of Azeroth. Mannoroth, eager to finally have his revenge on the night elves and the orcs, followed his master, searching for the orcs.

The Nethrezim Dreadlord, Tichondrius, gloated openly that the Scourge had succeeded where the orcs had failed. This only enraged Mannoroth further, and he was horrified to discover that the orcs had left. Mannoroth and Tichondrius, in pursuit, followed Thrall and the Horde across the sea to Kalimdor. Archimonde reminded Mannoroth, though, that the orcs could still be a useful tool to them.

Upon arriving in Kalimdor, Mannoroth sensed the foul presence of Cenarius, and he worried that the demigod could prove to be a chink in their plans. Tichondrius suggested that perhaps the orcs could be used to destroy Cenarius, for the orc who Mannoroth once corrupted years ago on Draenor, Grom Hellscream, was here, and had incurred the wrath of the demigod.

Mannoroth spilled his blood into a fountain of life, defiling it. Hellscream's shamans, sensing the power, led him to the fountain, and Grom unwittingly corrupted his clan by drinking its waters. Infused with the powers of the Legion, Cenarius was no match for the bloodlusted Horde.

With the demigod dead, Mannoroth appeared and took full control of Grom as the true invasion of Kalimdor began. Finding that the orcs were still a formidable force under the leadership of Thrall, Mannoroth formed a new plan to take him out. After Thrall reclaimed Grom, Mannoroth lured them into the craters formed by the falling infernals, where he hoped to battle them to the death. He very nearly did, until Grom suddenly struck out and killed Mannoroth. But in the battle, Hellscream, too, died.