The Prime Evil quest is the last quest of Act IV in Diablo III (2012), where the player defeats Diablo the Prime Evil. The quest begins after entering the Gateway to the Silver Spire.
Templar: The darkness grows around us.
Leah: How does it feel? Knowing you helped me become the Prime Evil? For all your mighty deeds, all you really accomplished was unleashing me upon the world. Some savior you are, nephalem.
Templar: Leah, wait!
Note: Aspect of Terror (Diablo's Herald) spawns in place of the Leah ghost.
Note: Head north to enter The Silver Spire Level 1.
LOCATION: THE SILVER SPIRE LEVEL 1
Tyrael: Diablo is climbing the spire to the Crystal Arch. We must hurry.
Mira Eamon: How could you convince my own husband to kill me? I could have been saved, but you made him cut me down!
Templar: No... that isn't her!
Note: The Aspect of Lies (Belial's Assassin) spawns in Mira's place.
Tyrael: The corruption is so much more thorough here than it was in the gardens, so much more complete. Diablo knows the spire is the heart of the High Heavens...
Note: Search for the portal to The Great Span.
LOCATION: THE GREAT SPAN
Tyrael: Wait... There is something different here.
Templar: We can face it!
Diablo: Look, Tyrael... your old lieutenant.
Izual: It seems we've both fallen from grace, Tyrael. Come, embrace your former lieutenant!
Izual: The chill of Hell will sap the life from your bones! You failed again, Tyrael! The corruption cannot be stopped!
Diablo: Look beneath you and see the ruin of Heaven.
Note: Head northeast along the long bridge and enter The Silver Spire Level 2.
LOCATION: THE SILVER SPIRE LEVEL 2
Tyrael: It is not far now. I only hope we are not too late. I can feel Diablo's corruption closing around the light of Heaven.
Deckard Cain: The Angiris Council is no better than the Prime Evils themselves. We are just pawns in their cruel games, and now you help the worst of them all?
Templar: What is this deception?!
Note: The Aspect of Hatred (Mephisto's Disciple) spawns in Cain's place.
Tyrael: The spire was once beautiful beyond measure...
Templar: Diablo has spared nothing in his assault.
Enter The Pinnacle of Heaven.
Imperius: Nephalem, I see you did not heed my warning. Or perhaps you think yourself strong enough to face me?
Necromancer: I come to kill another. Do not waste my time.
Tyrael: Imperius, stop this madness! Diablo is the enemy here, not the nephalem!
Imperius: Tyrael, I will deal with you soon enough. I will-- What is this? No! Diablo has reached the Arch!
Tyrael: No! Diablo has begun extinguishing the Crystal Arch; that's why the angels have fallen! If its light should go out forever... We must defeat Diablo before that happens!
Necromancer: We stand together as mortals.
Tyrael: Diablo's vile corruption bars our path. Stand back -- El'druin's light shall clear the way!
Imperius may yell a great deal, but he is still incapable of defying Diablo's power. I cannot be certain that I will do much better, but at least I know not to threaten potential allies needlessly.
LOCATION: PINNACLE OF HEAVEN
Tyrael: The gate has been opened, nephalem. This last trial is yours alone.
Necromancer: Thank you for leading me this far.
Tyrael: It was an honor. But this is the moment you were made for -- this is the hour of mankind's victory!
TYRAEL DIALOGUES (UNLOCK)
Note: Enter the Crystal Arch.
LOCATION: THE CRYSTAL ARCH
Templar: I've been trapped! You'd best go on without me.
Diablo: The seven Evils are one within me! I am legion!
Diablo: Enough! Let us see how you fare in my Realm of Terror!
LOCATION: REALM OF TERROR
Diablo: Only by defeating us can you return to your own realm! But none have ever crawled from the depths of their own terror!
LOCATION: THE CRYSTAL ARCH
Diablo: No! This wretched light must be eradicated!
Diablo: All that you have known -- all that you have ever loved -- shall die along with you, nephalem.
Auriel: The day is won. Diablo is vanquished, and all evil with him.
Necromancer: Evil retreats, but it does not die.
Tyrael: Time will tell.
(WARNING: Do you wish to travel to the next Act?)
NEXT -- CINEMATIC: A NEW DAWN
TOWNSFOLK DIALOGUES: THE CRYSTAL ARCH (UNLOCKED AFTER DIABLO'S DEATH)
TOWNSFOLK DIALOGUES: BASTION'S KEEP STRONGHOLD (UNLOCKED AFTER DIABLO'S DEATH)
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