SARGERAS

BURNING LEGION

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Magtheridon

Magtheridon, the former Lord of Outland, is a Pit Lord who conquered the ruins of the orcish homeworld following its destruction. His reign was ended by the arrival of Illidan Stormrage, who took Magtheridon's throne at the Black Temple for himself. Deciding that Magtheridon would have a further part to play, Illidan had Magtheridon's body dragged to the Hellfire Citadel where he imprisoned the Pit Lord, leaving him at the mercy of the fel orcs.[1] His rumbling cries are heard throughout the Hellfire Citadel. It is interesting to note that his wardens are not fel orcs, but normal green-skinned orcs. It seems that Illidan is keeping Magtheridon alive for the sole reason of creating more fel orcs under his rule.
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Mal'Ganis

Mal'Ganis was one of the Nathrezim or Dreadlords sent by Archimonde to police the Lich King. Mal'Ganis was chosen to head up the plot to turn Prince Arthas to darkness, and make him the Lich King's greatest champion. As Arthas and Jaina Proudmoore were investigating rumors of plague, they were attacked again and again by the forces of the Scourge posing as the personal army of the Dreadlord Mal'Ganis. Kel'Thuzad helped play the part by telling Arthas that it was Mal'Ganis himself and not the Lich King behind the plague. Each attack, each town destroyed hit at Arthas' weakness, his pride. Arthas began to take his inability to protect his people from the Scourge personally, and soon became obsessed with killing the Dreadlord. Mal'Ganis led Arthas to Stratholme, and left him with the choice of either slaughtering all of its inhabitants, or watching them fall to the plague. Arthas chose to kill his own subjects rather than let them become slaves to Mal'Ganis in death, massacring most of the inhabitants of the town. Mal'Ganis was there in the wreckage, and goaded Arthas once again to come to Northrend to finish their battle. As expected, Arthas took the royal fleet and sailed north. The Prince's obsession with the hated Dreadlord led him further down the path of evil, first lying to his men, betraying his mercenaries, and finally forsaking his own soul to take up the runeblade Frostmourne. The moment Arthas took up Frostmourne he became a tool of the Lich King, completely subservient to his will. This was what Mal'Ganis had planned all along. Confidently he approached Arthas and informed him of his fate. However, the manipulative and traitorous Dreadlord was himself betrayed, as the Lich King's first whispers to Arthas was that the time for his vengeance had come (this was the first step towards Ner'zhul's independence). Arthas killed the Dreadlord and ran off into the frozen wastes. (*)(*)(*)
Balnazzar

Balnazzar (a.k.a. Saidan Dathrohan, Champion of the Scarlet Crusade) was one of the three nathrezim siblings left behind in Lordaeron to oversee the demonic conquest of that land. The return of Prince Arthas, following the defeat of Archimonde, sent the three brothers packing, but they quickly regrouped and concocted a new plan to destroy Arthas once and for all. Though they (and Sylvanas Windrunner, who attacked Arthas on her own terms) didn’t destroy Arthas, the undead prince left Lordaeron, leaving Balnazzar to rule the Plaguelands. Soon after Sylvanas, forcibly joined by his brother Varimathras, laid siege to Balnazzar forces, and ultimely forced Varimathras to execute Balnazzar. He came to posses the body of Saidan Dathrohan, a founder of the Scarlet Crusade.
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Detheroc

The Dreadlord of the Nathrezim Detheroc and his two brothers, Balnazzar and Varimathras, were left to watch over the Legion's holdings in Lordaeron when Archimonde and the main force of the Legion left for Kalimdor to deal with the fleeing orcs and humans, as well as the night elves who had defeated them in ages past. Detheroc began to notice however that much time had passed without hearing a word from Archimonde. Arthas stormed into the palace and informed them that their Legion was defeated, and that their deaths would seal that fate. But they fled before he could strike. Hiding in Tirisfal Glades, they coerced Sylvanas into assisting them, and planned a coup to take back Lordaeron and rule the newly coined Plaguelands. Detheroc and his brothers assumed control of the Capital City and ambushed Arthas, but the resilient Death Knight battled his way through their forces and fled across the sea, to his master in Northrend. With Arthas gone, Detheroc and the other Dreadlords could concentrate their power in Lordaeron. But when Varimathras asked Sylvanas to join their new order, she refused, butchered his forces, and turned him to her own side. Detheroc was not so easily defeated. He used his powers of domination to control the human general, Garithos, and when Sylvanas launched her next attack upon him, he turned Garithos and his forces loose on her. But with Varimathras at her side, Sylvanas managed to keep Garithos at bay as she stormed into Detheroc's base and "tore him to bloody shreds" as Sylvanas put it.
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Dalvengyr

One the Dreadlords left in Lordaeron after the Legion's defeat, Dalvengyr and his kinsmen were not aware of Archimonde's destruction, and continued to wait for word from him as they stood their posts. After Kael'thas repaired the observatories in Dalaran's ruins, Dalvengyr led a force of undead into his territory and destroyed his outlying outposts. Garithos ordered Kael to defend Dalaran at all costs, but then removed his cavalry support. Kael was faced with a suicide mission until Lady Vashj arrived with her naga forces. Together, they destroyed Dalvengyr's bases and slew the Dreadlord.
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Varimathras(traitor)

A Nathrezim Dreadlord once in the service of the Burning Legion, Varimathras was forced into allying with the Forsaken under the direct control of Sylvanas Windrunner in exchange for sparing his life, after he and his brothers were overcome by her undead forces. He now resides within the Royal Quarter of the Undercity, standing at Sylvanas's side.