Controlled by Domination magic, Anduin is being forced to aid the Jailer's plan to remake reality. As time runs out to stop him, the champions of Azeroth must make a difficult choice: defeat the young king to save the cosmos, or risk everything in order to restore his soul.
Overview
Anduin battles players while battling his own Domination. Dominated Anduin's Kingsmourne Hungers separates players from their souls, allowing them to aid Anduin's true self, restoring Willpower.
Upon reaching 100 Willpower, Anduin manifests the source of his Domination temporarily, allowing players to combat it and benefit from the Grasp of Domination.
Tanks
Dark Zeal will stack until Anduin attacks a different target.
Soul Reaper inflicts substiantial Physical and Magical damage.
Damage Dealers
Seek out the opposite sign when afflicted with Blasphemy to remove the effect.
Defeat Monstorous Souls quickly when they reach low health to prevent Necrotic Detonation.
Defeating Anduin's Doubt and Anduin's Despair restores Willpower to him.
Healers
Seek out the opposite sign when afflicted with Blasphemy to remove the effect.
With a swing from Kingsmourne, Anduin destroys the arcane barrier Jaina has erected for herself, Uther, and Sylvanas.
Jailer/Anduin: Do you not understand? This one is bound to me.
Anduin plunges Kingsmourne into the ground, releasing a cloud of black smoke that grows to envelop him. Sylvanas begins running toward him.
Sylvanas: Anduin!
Within the smoke, Anduin continues holding a shaky grip on Kingsmourne. The blue orb at the center of the blade glows intensely. The weapon starts to drain energy (seemingly his soul) from his face as the Jailer whispers to him.
Jailer: Fulfill your final purpose: Annihilation. The fate of all who carry my blade.
Suddenly, a glowing hand is placed on Anduin's left shoulder and the draining comes to a halt.
Varian: My son.
Trembling, Anduin looks up and gasps when he sees Varian standing on his left side.
Varian: This blade does not belong to darkness. It was forged by valor.
Another hand is placed on Anduin's right shoulder.
Varok: And also...
Anduin looks over and sees Varok Saurfang standing on his other side.
Varok: by honor.
Varian: Its legacy, and ours, are with you, even here.
Varian and Varok kneel down on either side of Kingsmourne and stretch out an arm each to grasp Kingsmourne's hilt. Their hands fade away, leaving only Anduin's, now with a firm grip on the sword.
Anduin gathers his strength and, with a scream, splits Kingsmourne in half as the screen fades to white. On the other side, Anduin—color restored to his face and hair—kneels on the ground with the glowing halves of the sword, restored to Shalla'tor and Ellemayne, in his hands. His Domination armor fades away into smoke, leaving only his normal armor underneath. The energy orb that was contained in the sword, now released, hovers silently in front of him. Jaina kneels down behind Anduin and places a hand on his shoulder as he looks at the orb.
Anduin: Arthas...
Sylvanas and Uther walk up to the orb as well.
Jaina: Is this all that remains of him?
Uther: The last flicker of his scarred spirit, consumed in the forges of the Jailer.
Sylvanas: No crown. No throne. Not even a soul left for judgement. I hated you, hunted you, and with each selfish act... became you. That is my burden to bear.
She and Uther glance briefly at each other.
Sylvanas: But your legacy... is at an end. Begone then, Arthas Menethil. May the last whisper of your name fade... and be forgotten.
The four watch in silence as the orb shrinks and eventually fades away. Uther closes his eyes with a pained look on his face and Jaina lowers her head.
Varian
Varok
"Its legacy, and ours, are with you."
Anduin freed from Domination
The last remnant of Arthas
Post-cinematic dialogue
Anduin Wrynn says: You fought... to save me. Thank you.
Lady Jaina Proudmoore says: I would never give up on you, Anduin.
Sylvanas Windrunner says: You need time to recover, but we must press on. The Jailer has reached the final chamber of the Sepulcher. He is perilously close to victory.
Anduin Wrynn says: The consoles have been infused with Domination magic. They will subjugate anyone who tries to follow him.
Uther the Lightbringer says: There must be a way.
Firim says: The answer lies within the mysteries of the First Ones. Their secrets can guide our way forward... if forged by the proper hand.
Trivia
In early PTR builds, his Adventure Guide entry read: Completely under Zovaal's control, Anduin stands ready to destroy any who oppose his master. As time runs out, a difficult choice must be made. Defeat the boy king to save the cosmos, or risk everything in order to restore his soul.
Anduin Wrynn.png)
Kingsmourne Hungers separates players from their souls, allowing them to aid Anduin's true self, restoring 
Willpower.
Grasp of Domination.
Tanks
Dark Zeal will stack until Anduin attacks a different target.
Soul Reaper inflicts substiantial Physical and Magical damage.
Damage Dealers
Blasphemy to remove the effect.
Necrotic Detonation.
Healers
Befouled Barrier consumes the healing of players standing in the area.
[Dreadful Helm Module]
[Beacon of Stormwind]
[Anduin's Princely Vestments]
[Wrists of the Wicked Star]
[King's Wolfheart Waistband]
[Remnant's Blasphemous Scourgebelt]
[Soulwarped Seal of Menethil]
[Soulwarped Seal of Wrynn]
[The Lion's Roar]
[Accelerated Cold]
[Combusting Engine]
[Controlled Destruction]
[Embrace of Earth]
[Fueled by Violence]
[Nourishing Chi]
[Perforated Veins]
[Powerful Precision]
[Taste for Blood]
[Vengeful Shock]
[Sepulcher of the First Ones]
[Coming to Terms]
Patch 9.2.0 (2022-02-22): Added.