Prime Evil Diablo III Guide
Last update: 11 May 2016
Cross the Great Span of the Silver Spire
This final quest of the game will begin as soon as you've entered the Gateway to the Silver Spire. Head forward to meet an illusion of one of the characters that died during your journey. Talk to that person. The conversation will soon be interrupted, because the illusion will transform into one of Diablo's servants.
Once you've defeated the monster head forward. The location you're exploring isn't that being and at the end of the bridge you'll locate a portal which will transport you to The Silver Spire Level 1.
As soon as you've used the portal you'll come across another illusion of a dead character. Initiate a conversation and be ready to defeat a demon that is one of Diablo's servants.
This location is much bigger than the one you've explored at the beginning of the quest. Watch out for rifts, because flames will be coming out of them and you may receive fire damage. As for the monsters, you'll be dealing with the demons you're already familiar with, but also with several new types of creatures. Terror Demons inflict serious damage and they have a lot of health points. Morlu Incinerators can create circles of fire on the ground that deal serious damage and they can also move fast. Shade Stalkers will be frequent targets of your attacks, as well as Hell Witches and Gloom Wraiths.
Continue exploring The Silver Spire Level 1 until you locate a portal that can transport you to The Great Span.
Kill Izual
Cross the bridge and get ready for another one of Diablo's surprises. This time you'll be forced to fight a fallen angel named Izual (you've already met him in Diablo II). The boss doesn't have a lot of health points, however he's surrounded by smaller demons. The biggest threat is his freeze attack that can immobilize you completely even for a few seconds. Watch out for white crystals seen in the air, because they explode after a while and they can also freeze you if you were inside the radius of the blast. Another one of Izual's attacks is to fire ice projectiles in all directions. They won't stop you, but they can slow you down. The fallen angel is very fast and you should know that the arena where you're fighting doesn't give a lot of places where you can escape.
Climb to the Pinnacle of Heaven in the Silver Spire
Once you've defeated Izual use the second part of the bridge, eliminating smaller demons along the way. Locate a new waypoint and then approach a portal which will transport you to The Silver Spire Level 2.
Get ready to encounter one more illusion after exiting the portal. The deal here is similar to previous encounters so expect to be attacked by a servant of Diablo.
Once you've defeated the demon start exploring this large location. You'll be encountering the monsters you already know. Don't forget to kill Morlu Incinerators as soon as you can, because they can summon more creatures.
Your current objective is to find the last portal which can transport you to the Pinnacle of Heaven. You'll soon start the final battle, so wait for your skills to recharge and resupply before using the portal.
Talk to Tyrael
Enter the Pinnacle of Heaven. Imperius will try to interrupt in your journey, but because of Diablo him and all other angels will lose their powers. Talk to Tyrael who should be standing next to you.
Go to the Crystal Arch
Head forward and use the portal located at the end of the corridor.
Find Diablo
Begin exploring the Crystal Arch. Diablo will soon imprison your companion and it means that you'll have to take part in the final battle alone. Head forward and use the stairs to reach the arena.
Kill Diablo
The first phase of the final battle will take place in the Crystal Arch. This is a large location and therefore you'll have plenty of room to move around. Notice two healing shrines and remember to use them wisely. The most important thing about this battle is that you should keep moving. Diablo will be deploying traps similar to the one that has stopped your ally. You can't destroy them and if you get caught Diablo will grab you and will heavily injure you by throwing you to the ground. Thankfully you can find out where the next trap will be deployed, because the ground will become darker in that place. This should give you enough time to move away.
Diablo can teleport himself across the battlefield, so don't be surprised if he suddenly appears next to your character. The boss uses his claws in melee combat and he also likes to throw fireballs in all directions (you should know this attack from Diablo II).
Diablo can also cast a single fireball and that fireball creates a fire circle on the ground after the explosion. Stay away from the circle, because otherwise you'll catch on fire and most likely lose a lot of health points. Thankfully the fire circles don't work as traps, so you can escape without problems. Diablo's last attack is to burden you with a destruction curse and it inflict additional damage for a few seconds.
Kill the Shadow of Diablo
Once you've sufficiently injured Diablo (he should have a little more than half of his life bar left) you'll advance to phase two of the battle. This phase takes place in the Realm or Terror and your job is to kill the Shadow of Diablo. The shadow uses the same tricks as the main boss from phase one.
The Shadow of Diablo shouldn't be your only concern, because once in a while you may also be forced to with a Terror Phantasm. The location where you're fighting may also cause problems, because you'll be dealing with low visibility. Be prepared to repel any kinds of attacks and continue fighting until you've killed the Shadow of Diablo.
Kill Diablo
Once you've killed the Shadow of Diablo you'll return to the Crystal Arch and the last third phase of the battle will begin. Diablo will have the same health bar as he did at the end of phase one. He'll also be using the same tricks - traps, circles of fire, curses, shooting fireballs in all directions etc. There's only one new attack he'll start using and you probably remember it from Diablo II, because it's about sending a powerful ray. If you get caught by the ray you'll receive an enormous damage and therefore you can die really quick.
It's not unusual that this final battle will be long and will require you to stay focused, but thanks to that killing Diablo should provide some satisfaction.
Talk to Auriel and bring your quest to an end
After you've killed Diablo in the Crystal Arch a lot of characters will appear here - Auriel, Itherael, Tyrael and your three companions. Talk to Auriel and watch the epilogue. Congratulations on ending the game and don't forget to repeat the campaign on higher difficulty levels.