Six days have passed since Illidan and his forces made their desperate escape from the clutches of the Undead Scourge in Icecrown Glacier. Illidan is still reeling from the grievous wound upon his chest from the slash of the Frostmourne, and slowly feeling its dark magical effects. Regretful and ashamed of his failure on destroying the Frozen Throne; Illidan swore to finish what he was set to do and take revenge on Arthas when he returns to Northrend. Knowing that the undead armies are now stronger and more dangerous, with the Lich King that empowers them now freed and merged; Illidan calls upon his loyal lieutenants to discuss their new plans on defeating the Undead Scourge.

Kael: "With Ner'zhul becoming one with Arthas, there is no telling how much powerful the Lich King has grown. The Undead Scourge are sure to have become stronger now than ever before."

Illidan: "I have vanquished the leader and most powerful of the Nathrezim, along with his demonic forces in Felwood. We have defeated Magtheridon and his armies to take over Outland as our own. Just as our successes here before; the Lich King cannot match our cunning, or our will. Arthas and his Undead Scourge will be destroyed once and for all! I swear it will be done, one way or another!"

Vashj: "What are you proposing that we should do to defeat the Lich King now, Lord Illidan?"

Illidan: "I have concluded a new plan that will surely deal a serious blow to the Scourge. We shall release the demon and fel orc prisoners from the dungeon cells, and use them against the undead."

Kael: "You'll have the surviving demons and fel orcs of Magtheridon to fight the Scourge for us."

Vashj: "A very bold and cunning plan, Lord Illidan. Though it may be a risk to release those demon and fel orc prisoners from their cells, they may indeed prove to be useful for our cause after all."

Illidan: "Yes. The demons and fel orcs of Magtheridon are the perfect weapons against the Lich King and his undead. Just as what I once did with some hapless satyrs against Maiev; we shall let the vile undead, and the demons and fel orcs destroy all one another. When it is set and done, we will come and finish what we started. Victory shall be ours! This time, Arthas won't be so lucky!"

Having no signs of doubt and contradiction from both Prince Kael'thas and Lady Vashj; the plan against the Scourge was set as Illidan begins to make his move in setting his scheme into motion. As a reward for such loyalty and support for him; Illidan granted both Kael and Vashj each one of his few remaining vials of eternity, which he has somehow was able to keep for ten thousand years. Two days later, Illidan meets up with another one of his lieutenants in Outland, Akama. Known as the Elder Sage of the Draenei, Akama is now as the head jailor of the demon and fel orc prisoners.

Far to the southeast area of the Black Citadel is a mountain range where the ruins of what used to be a stronghold for the Shadowmoon Clan lies. After Illidan and his forces defeated Magtheridon to take control of Outland, Illidan ordered his laborers to build a large dungeon fortress over the Shadowmoon ruins. The Pit Lord Magtheridon refused to give up Outland and remained defiant even after being already defeated in the Black Citadel. Illidan then eventually killed Magtheridon before he, along with Kael and Vashj, made their invasion on Northrend. The surviving demons and fel orcs that are loyal to Magtheridon and have also refused to serve under Illidan's rule were brought to the newly built dungeon fortress upon the Shadowmoon ruins as enslaved prisoners. As of now, Illidan plans to release the demon and fel orc prisoners, and bent them all to his will even if it means by force, for him to have them as deadly warriors to battle against the Undead Scourge.

Akama: "Are you sure about this, Lord Illidan? These cursed demons and orcs are too dangerous to be freed. Know that their loyalty still remains to Magtheridon. They will never side with you."

Illidan: "I have great use for them, Akama. They will be the perfect warriors against the Scourge when we return to Northrend. You need not to worry about them threatening your people again, Akama. In fact, this may even be the last time you will see these demons and fel orcs as they are just a simple means to an end, when I have them battle against the vile undead armies on Azeroth."

Akama: "You shall use them as your weapons on a suicide mission to help you get your revenge. Very well, so long as my people and I will no longer see these wretched curs on Outland again."

Illidan: "This quest is my sworn task to complete for the demonlord, Kil'jaeden. I cannot afford to fail on this mission again, or his wrath shall be the end for all of us. By destroying the Legion's hold and taking control over Outland; I have betrayed him greatly. Yet he let it all be for the sake of letting me finish my quest in whatever I can use upon my side to defeat the Scourge on Azeroth. This is more than just for the sake of taking my vengeance on the Lich King in Northrend, Akama."

Akama: "Then do what you must, Lord Illidan. Having the demons and fel orcs fight the undead will surely give you the advantage for you to finish your quest, as it is also the perfect way for us to permanently get rid of them from Outland, and end their vile curse upon us once and for all."

Illidan: "I shall be bringing you and your warriors along as well on our battle against the Undead Scourge, Akama. The Lich King, the dark lord who commands the undead, is none other than the spirit of the orc, Ner'zhul. He has grown powerful over the years he commanded the undead, and has now freed himself when he merged his spirit with the human death knight that I have faced."

Akama: "Ner'zhul! That cursed orc! Beyond my hatred upon these demons and fel orcs over the years, there is one vile creature whom I dreamt of killing by my own hands for so long! Ner'zhul is responsible for the destruction of this world and turned it into the barren wasteland it is today! We will gladly join along with you, Lord Illidan, as we shall also take our revenge on Ner'zhul!"