Mannoroth Mannoroth was a pit lord whose ruthlessness and vile cunning made him into one of the favoured lieutenants of his masters , Archimonde and Kil ' jaeden , the champions of the Burning Legion . Known as “ the Destructor ” and " the Flayer " , Mannoroth was the barbaric leader of the pit lords when the dark titan Sargeras subjugated them and bent them to his will . When Archimonde was placed in command of the pit lords , he recognized Mannoroth ’ s value as a brutal , bloodthirsty fighter and made the pit lord his second - in - command . Mannoroth helped lead the Burning Legion in assaults on countless worlds , and led the first invasion of Azeroth . He is voiced by Arthur Burghardt in . Biography . War of the Ancients . Mannoroth was among the demons who ventured into Kalimdor during the War of the Ancients . He singlehandedly slaughtered entire regiments of Kaldorei defenders and sowed chaos by unleashing squads of doomguards across the land . Though he battled with brutal ferocity and slaughtered many , he was defeated by Cenarius and his followers and sent back into the Twisting Nether when the Well of Eternity was destroyed . Although his forces were ultimately defeated and forced to flee from Azeroth , Mannoroth was pleased with the level of carnage that he had inflicted . Mannoroth and the orcs . In preparation for the Burning Legion ’ s second invasion of Azeroth , Kil ’ jaeden dispatched Mannoroth to Draenor . Describing him to Gul ' dan , Kil ' jaeden mentioned that " Mannoroth is known for many things . Patience is not among them . " There , twelve clan chieftains of the orc Horde drank from Mannoroth ’ s blood and fell prey to the curse of bloodlust . Their corruption quickly spread to the rest of the Horde and ultimately led to their ill - fated assault on the human kingdoms on Azeroth . Mannoroth made his mark upon the orcs in Draenor . Many years before the Dark Portal was first formed , Mannoroth , under orders from Kil ' jaeden , took part in the plan to put the orcs under the thumb of the Burning Legion . Though he would later say that the orcs were his " by right " , it was likely just plain arrogance of his blood pact with the orcs . His own master , Kil ' jaeden , could claim rule over the orcs since it was he who discovered them . They would serve as harbingers of chaos , wiping out any potential resistance when the Legion arrived on a world . With the help of Gul ' dan , the Blood of Mannoroth was drunk by the chieftains of the clans , with the exception of Durotan of the Frostwolf . They were engulfed by a demonic bloodlust that wiped out countless draenei and damned the orcs forever . However , after the Dark Portal was opened and the orc s 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 . The Third War . Kil ' jaeden , however , ignored Mannoroth ' s desires for vengeance , and crafted a new pawn : the Lich King and his undead Scourge . This Scourge would succeed where the orcs had failed . Finally , Archimonde was summoned by the lich , Kel ' Thuzad , into the world of Azeroth . Mannoroth , eager to finally have his revenge on the night elves and the orcs , followed his master . The dreadlord , Tichondrius , gloated openly that the Scourge ( whom he regarded as his in the same way Mannoroth felt about the orcs ) had succeeded where the orcs had failed . This only enraged Mannoroth further , and he was infuriated 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 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 . At Tichondrius ' suggestion , Mannoroth spilled his blood into a fountain of life , defiling it in hopes the orcs would find it and drink it . Hellscream ' s witch doctor s , sensing the power , initially led him to the fountain , but quickly realized it was cursed , and implored Hellscream not to meddle with it . Grom ignored them and corrupted his clan by drinking its waters . Infused with the powers of the Legion , Cenarius was no match for the bloodlust filled Warsong Clan . With the demigod dead , Mannoroth appeared and took full control of Hellscream as the true invasion , the " Legion ' s " invasion , of Kalimdor began . Realizing that the remaining orcs were still a formidable force under the leadership of Thrall , Mannoroth formed a new plan to take him out . Thrall found his former friend Grom had fallen under the sway of the legion and vowed to save him . With the help of Jaina Proudmoore and her expedition , the orc - human alliance successfully defeated Hellscream ' s corrupted clan , captured Hellscream , and purged him of his madness . The taint however , was still within him . Mannoroth ' s defeat . After Thrall reclaimed Hellscream , Mannoroth lured them into the craters formed by the falling infernal s , where he hoped to kill Thrall and re - enslave Hellscream . Thrall confronted the demon lord in battle pouring all his strength and hatred for the demon into one powerful blast with the Doomhammer . Mannoroth applauded the effort and revealed that it had caused only a slight scarring of his wing . He then tossed the young war chief against a cliffside with a powerful charge , knocking him out cold and leaving only Hellscream . Mannoroth reminded Grom that he owned his body and soul and gloated that the blood curse could never be broken . Hellscream then faced the choice between giving into the demon corruption once more or resisting and saving Thrall , and indeed his entire race . Refusing to accept that the orcs were cursed forever , he chose his kin . In a heroic last stand Grom slipped past Mannoroth ’ s defenses and sliced open his chest . Mannoroth was thus slain by his greatest creation and most favored pupil , Grom Hellscream — a fitting irony , some might say . The demonic fires erupted outward , destroying the astonished Mannoroth and mortally wounding Hellscream . With the death of Mannoroth the blood curse on the orcs was finally lifted . After his defeat , Mannoroth ' s horned skull and armor were spirited to Orgrimmar and were attached to a large , irregularly shaped tree ( possibly shaped or newly grown by tauren to accommodate the trophies ) . However the large double - headed sword used by the mighty pit lord remains in Ashenvale , forever sundered and locked in time to show where the bloodpact was ended . The remains have become a memorial to warn against consorting with demon s and celebrating the feat of Grommash Hellscream in finally lifting the blood curse . In World of Warcraft . Players can see Mannoroth ' s broken weapon , armor and skull in World of Warcraft . In The Burning Crusade . In the Burning Crusade we see Mannoroth battle with Grom Hellscream . In Cataclysm . In Cataclysm , Mannoroth and Varo ' then are the final bosses of the Well of Eternity instance . In Warlords of Draenor . Adventurers encounter an alternate timeline version of Mannoroth on Draenor , but events play out differently with the interference of a Garrosh Hellscream bent on changing the destiny of the orcs . Personality . Mannoroth was a simple being with no overriding ambition to change his station in life . Craving blood and carnage over everything else , he willingly acted as an enforcer for Archimonde and the Burning Legion . His only desire was to wage unending war against the mortal races of the universe . He was a terribly efficient weapon of destruction for the demonlords and could always be found at the forefront of their invasion forces . Mannoroth had forever been cursed with an immeasurable , unending thirst for blood . Even the bloodlust of the orcs was a minor compulsion compared to the absolute addiction that bloodletting was for Mannoroth . In the absence of mortals to fight , Mannoroth often turned on his own demon kin , slaying felhounds and infernals with an unnerving sense of satisfaction . He preferred the kill to the chase , and would quickly slay mortals who were unfortunate enough to stumble upon him . Mannoroth sought out the most concentrated area of foes and wades into battle . He was not happy unless he was spilling the entrails of his enemies at his feet . When a victim fell , he usually spent an extra attack or two on the victim making sure the target was quite dead . This could be quite messy , which was exactly how Mannoroth liked it . In fact , he could get a bit reckless if foes were not dropping to his massive two - bladed sword at least every attack .