
The War of the Ancients
ut of all the Watchers in the tomb, only Maiev managed to avoid a watery death. Illidan's naga allies sent repeated attacks against Maiev's greatly depleted forces, but Maiev dispatched a runner who reached Malfurion and asked for help. He and Tyrande arrived in time to rescue the warden, but Illidan eluded capture.
The three night elves followed Illidan to Lordaeron, where Illidan and several naga spellcasters began channeling a powerful spell through the Eye of Sargeras. Malfurion and Maiev arrived in time to stop the spell before it could be completed. Furious and exasperated, Illidan explained that he had been trying to wow gold destroy the Frozen Throne and its occupant, the Lich King. Naturally Illidan made no mention of his pact with Kil'jaeden, for Malfurion would not have understood. In any case, due to Malfurion's interference, Illidan had failed, and so the pact was now void.
Lord of Outland
Soon Malfurion and Illidan learned that Tyrande and a small group of her Sentinels had been swept down the River Arevass and were under attack by the Scourge. Illidan still loved Tyrande, and so he was quick to offer his assistance. For Tyrande's sake, Malfurion hesitantly agreed to work with Illidan. Malfurion established and defended a night elf base while Illidan and his naga retrieved Tyrande and her soldiers.
In return for Illidan's rescue of Tyrande, Malfurion declared that he pardoned Illidan for his dangerous spellcasting. Even so, he warned Illidan never to threaten the night elves again. Largely uninterested in the race he had left behind, Illidan agreed to Malfurion's terms and opened a portal to Outland, where he hoped to evade Kil'jaeden's wrath. The Burning Legion had little tolerance for failure.
Consumed by the desire for vengeance, Maiev could not relinquish the hunt. She and a small group of her followers pursued Illidan through the portal. Illidan was outnumbered, and so he was eventually recaptured.
Fortunately he was only outnumbered because he had dispatched Lady Vashj and her naga to recruit further allies: Prince Kael'thas Sunstrider and his group of blood elves. These blood elves soon followed the naga to Outland and freed Illidan, who promised to teach them how to feed their addiction to magic. Kael'thas swore allegiance to Illidan, and the prince helped his new lord close all the portals on Outland. By carrying out this endeavor, Illidan hoped to cut off further demonic reinforcements from the Twisting Nether and block any attempts by Kil'jaeden to locate Illidan.
The ruler of Outland at the time, a pit lord named Magtheridon, became a feasible target. Illidan led the powerful army of blood elves and naga against Magtheridon, defeated him, and took possession of his fortress, the Black Temple.
Yet Illidan did not celebrate his conquest for long. In a storm of magic and fury, Kil'jaeden descended upon Outland, regardless of the fact that Illidan had closed all portals on the planet. Illidan had colossally underestimated the demon lord's power.
Thinking quickly, Illidan told Kil'jaeden that he had only come to Outland to bolster his forces before making a final assault upon the Frozen Throne. Kil'jaeden was hardly appeased, but he decided to give Illidan one last chance. He warned Illidan that failure would result in death.
With no other option, Illidan led the blood elves and naga back to Azeroth. The Scourge kept Illidan's army at bay until Arthas and the crypt lord Anub'arak arrived. Arthas and Illidan faced off in single combat, and Arthas was the victor. He warned Illidan to leave Azeroth and not return.