The Lord of the Rings Online: Minas Morgul

Waken from the centuries of slumber, the shade of Isildur reveals to Glorfindel, Elrond, Gandalf and the player his sorry tale: the King who cursed the Men of Dunharrow to an unending existence for breaking their oaths had failed to fulfill the oath of his own – to deliver the Enemy's One Ring to Rivendell – causing his spirit to linger in the Gladden Fields after his death until the river-maiden of Gladden found him and put him to slumber to ease his suffering. To fill the gaps in their knowledge, Isildur tells them of his last years and the War of the Great Alliance against Sauron at the end of the Second Age.

Isildur's tale complete, the shade is no closer to ending its existence. The once-King reveals that he is tormented by a vision of a rotating beacon under the sign of a crescent moon. This describes the highest chamber in the Tower of Minas Ithil, the city that for the past thousand years has been known as Minas Morgul and Gandalf theorizes that this is where Isildur's remains are kept after they have been dug out by the Enemy's servants searching for the One Ring in the Gladden. Their affairs in the North put aside, Gandalf and the player travel back to Mordor after some time of absence, with Gandalf continuing to pouring over the mysterious Black Book of Mordor found in the Iron Hills.

While the player was away in the North, the soldiers of Gondor have made effort to establish footholds in Gorgoroth and King Elessar now tasks the Rangers of Ithilien led by Steward Faramir with reclaiming the Morgul Vale and cleansing the Dead City of evil that lies within. Meanwhile, the Gúrzyul Ugrukhôr and Lhaereth send their forces to attack the city as well, for it has become the domain of Gothmog, the Witch-King's servant who had fled from the Battle of the Pelennor Fields and had been hiding within the city walls ever since in fear of mortality, no longer able to return from the void without his master. Lhaereth and Ugrukhôr's hatred for Gothmog and his servants creates enough chaos to allow the player and a group of Rangers to sneak into the city, but their entry into Gothmog's tower is barred a Watching-Stone Spirit. Gandalf devises a plan to fool the spirit with the mask of the Weeping Warrior Karazgar, which he took after disarming him in Ered Mithrin. He and the player ask Ayorzén, the Easterling war-master knowledgeable in the Enemy's affairs, to impersonate Karazgar and the Easterling agrees.

Disguised as the Weeping Warrior, Ayorzén takes the player and a Grey Company Ranger to deliver as prisoners to Gothmog and the spirit allows them to pass. Upon seeing the Dread Terror himself, Ayorzén immediately flees while the player and the Ranger battle the wraith. The player eventually overpowers Gothmog by reminding him of his many defeats when Ugrukhôr and his minions arrive seeking the same goal. Ugrukhôr wounds the Ranger and prepares to battle the player when Gothmog stabs him in the back in his last act of defiance before expiring himself, his mortal existence finally at its end. The player finds and retrieves the casket with the dust that once was Isildur's bones, which Gandalf arranges to deliver to Rivendell. With both the King of Gondor and the Enemy's Ring having arrived to the House of Elrond, the oath of Isildur is finally fulfilled and he peacefully passes from the world.

In the end, the Black Book is revealed not to be an artifact of Sauron's evil but the work of a Zhélruka dwarf who lived almost a thousand years ago. After the battle of Fornost the dwarf Voin had met the prince of Gondor Eärnur and adventured with him and his knights for many years. When the time came for Eärnur to succeed his father on the throne, Voin parted ways with his friends and returned home. But when after seven years Voin learned that Eärnur had ridden to the gates of Minas Morgul to confront the Witch-King and was never seen again, he abandoned the life he had and went to search for his friend. Voin entered Mordor as a slave and after much struggle and hardship made his way to the Dread City, where he found Eärnur still alive but unable to leave because of the Witch-King's enchantment put on him. Voin provided comfort to his friend during his long torture, until he was eventually unmade and reborn as a wraith named Mordirith in the service of the Witch-King. Seeing his friend not just killed but erased, turned into a creature of evil who no longer recognized his friend, made Voin write his account in a Mordor-bound tome so that the memory of the man Eärnur was would not be forgotten. Voin then left Mordor and returned to his home in the Iron Hills, where the Black Book was eventually found.