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. Upon the completion of the fortress, the remaining demon and fel orc forces of Magtheridon were brought within the dungeon as enslaved prisoners upon strongly refusing to serve the new Lord of Outland, Illidan. With Akama and his elite draenei warriors serving as the jailors inside the dungeon fortress; the imprisoned demons and fel orcs languish within their dark magically sealed prison cells daily, awaiting for whatever fate that may next come upon them all. Huge numbers of demons and fel orcs were slain when Illidan and his forces have invaded Outland to defeat Magtheridon, but the surviving demons and fel orcs are still vast enough to be a full army.

The demons, and the fel orcs are separated upon two different divisions of prison cells within the dungeon fortress. Altogether, the demons and fel orcs remain powerless inside their magical cells and would never be able to break free on their own, unless they are to be released by their jailors. It was but another day for the imprisoned demons and fel orcs when all of a sudden, Illidan made an unusual visit to the dungeon fortress. Upon his sudden visit, Illidan speaks with Akama about a certain unknown plan. By the end of the conversation, Illidan and Akama, along with the other draenei jailors, went into the dungeon chamber of the demon prisoners. Amongst the imprisoned demons is the elite doom guard, Arzeth the Merciless, former demon captain of Magtheridon and a loyal servant of the Burning Legion. Amongst the remaining demons of Magtheridon, Arzeth is the strongest living one next to the now deceased Master of Pain. Illidan walks onto the center of the dungeon and casts a magical spell on the cage of Arzeth, unlocking the doors and releasing the doom guard. Illidan begins to speak as he bargains with Arzeth and the other imprisoned demons.

Illidan: "I shall be keeping this short and straight for you, demons. I have shown my strength and power before you when I defeated your former master at the Black Citadel. I decided to spare each of your wretched lives in exchange for your allegiances, but you all foolishly refused. Now, I ask you once again, demons. Serve me, and you will all be freed from this prison. Fight for me, and you shall be rewarded… or would you all rather rot to death in these dungeons? What say you?"

Arzeth: "Do you think you can persuade us with your little bargain, elf demon hunter?! You think this petty dungeon fortress could hold us forever?! Lord Magtheridon may have been defeated, but we are the warriors of the Burning Legion! These lands are ours! Outland rightfully belongs to the Legion! You and your lapdogs deserve to burn by the flames, Illidan! Your petty bargains will not work on us, demon hunter! You are no ruler, nor a commander to us! You're just an arrogant fool!"

With Arzeth's statements against Illidan; the other imprisoned demons have begun laughing as an insult and mockery against Illidan. At that moment; Illidan suddenly bursts in anger, and viciously attack Arzeth. Despite the grievous injury upon his chest from the Frostmourne; Illidan is still able to move and battle effectively. Arzeth attempted to fight back against Illidan, but the demon stands no chance against the enraged demon hunter. Illidan killed Arzeth in just a short yet vicious battle. Illidan wants to show the other demon prisoners of what it means on mocking his own powers and superiority. The demon hunter channels his mana energies within, and casts a magical fire spell to burn the corpse of the dead doom guard into ashes. The once proud and strong Arzeth the Merciless is now nothing more, but mere remains of burnt ashes. Standing silently in pure rage, Illidan looks upon all the other imprisoned demons and sends his own clear message to them about defying him.

Illidan: "Is there no one else?!... Is there no one else?!"

Upon witnessing the short yet vicious battle between Illidan and Arzeth; the other demon prisoners, who have been amused by Arzeth's defiance against Illidan, have all become suddenly speechless. After a few minutes of silence; the imprisoned demons within the cells one-by-one began bowing their heads, showing the sign of finally submitting themselves to the new Lord of Outland. Out of respect, or out of fear; the demons have finally given their allegiances for Illidan. Upon witnessing everything that happened between Illidan and the imprisoned demons; Akama and his other fellow draenei jailors began to remove the magical seals of the prison cells, and freed the demon prisoners.

Illidan: "Hear me, demons! I rule Outland now! I reign supreme! Betray me, defy me, and you will meet your demise by my blades! Now… I command you all to fight! Fight for your new master!"

Demon Overlord: We… fight!

Upon unsealing the magical prison cells; the demons made their way out to the open courtyard of the fortress, whilst being closely watch by a group of naga warriors that Illidan brought with him to the dungeon fortress. With the demons now freed and tamed under his command; Illidan, Akama and the other draenei jailors head onto the area of the dungeon fortress where the fel orcs are held. Amongst the fel orc prisoners within the dungeons is the legendary chieftain of the Shattered Hand Clan and warchief of the fel orc clans, Kargath Bladefist, who tried to resist against Illidan and his forces after the fall of Magtheridon. Kargath is amongst the well-known veteran orc chieftains that battled against the Alliance Expedition. Kargath, along with most of the surviving orcish clans on Outland, have been permanently transformed to fel orcs over the years passed ever since they drank the blood of a powerful demon for the second time in their lives, the blood of Magtheridon himself.

Upon reaching the cell division for the fel orcs; Illidan walks into the center of the prison hall with the fel orcs staring at him from inside the magically sealed doors. Amongst the prison cages is the cell of Warchief Kargath himself. Alongside Kargath are three of the other fel orc chieftains; Tagar Spinebreaker, the old chieftain for the Bonechewer Clan, Keli'dan the Breaker, a powerful fel orc warlock who had become the chieftain of the remaining fel orcs from the Shadowmoon Clan since after the destruction of Draenor, and the old infamous Zuluhed the Whacked, a former shaman and a veteran of the Second War who somehow was able to return on Draenor, and is now the chieftain of the surviving Dragonmaw orcs on Outland as a powerfully permanently mutated fel orc warlock.

Illidan: "I have a proposition for all of you. I will be granting your freedom out from this prison, with only one small thing in return; your allegiance. Serve me as your new master. Fight for me."

Kargath: "You speak to no slaves, elf demon. We here are warriors, and ruthless conquerors! We own Outland. We serve only those we deem to be worthy, those of great strength and powers. The Burning Legion have given us true power long ago, and with it, we had pledged ourselves to them."

Illidan: "And I have destroyed your demon masters at the Black Citadel before your very eyes…"

Kargath: "Perhaps, you have… but you can make no real offer that will make us serve you. I am the Warchief of the Fel Horde, and despite having us imprisoned here, we refuse to serve as your servants, elf demon. Never shall my warriors and I serve anyone blindly without anything for us."

Illidan: "Nothing to offer, you say? Tell me, Bladefist. Do you wish to fight upon a glorious bloody war once more? Do you wish to conquer enemies that are beyond anything you have fought before? Do you seek revenge for the destruction of this world, and the near extinction of your brethren?"

Kargath: "Hmm… I am listening…"

Illidan told Kargath and all the other fel orcs everything about Ner'zhul who became the Lich King that commands the armies of the undead on Azeroth. Being remembered as the former chieftain of the Shadowmoon Clan, and the former Warchief of the Horde of Draenor; Ner'zhul is responsible for the catastrophic destruction of the planet, and turning it into the Outland that it is today. Kargath and the other veteran fel orc chieftains recalled how Ner'zhul betrayed, and abandoned them into a certain doom for the sake of his own pride and selfish plans. Now being called as the creator and the commander of the Undead Scourge; Kargath and the other fel orc chieftains eventually agreed to become part of Illidan's forces. Reluctantly swearing their allegiance upon Illidan; the Fel Horde made it as a decision under Kargath's consideration, for the sake of getting vengeance on Ner'zhul. With the fel orcs now joining Illidan's forces; the fel orcs have also been freed from their prisons.

Tagar: "The Bonechewer fears no living, nor dead! We shall destroy Ner'zhul and his minions!"

Keli'dan: "I cannot wait to see our former master and clan chieftain again after all these years."

Kargath: "I shall make this clear, Illidan. I do not trust you, nor do we serve you willingly, but if it means to get our revenge on Ner'zhul, then we shall crush this Scourge of his and destroy him!"

Illidan: "You will all have your vengeance when you face Ner'zhul's armies in a glorious battle!"