Heart of Sin Diablo III Guide

Last update: 11 May 2016

Go through Arreat Crater and find the Tower of the Damned

This new quest will begin automatically after ending the conversation with Adrii in the Edge of the Abyss. Step through the gate to find yourself in Arreat Crater Level 1. A waypoint should be located somewhere nearby.

Get ready for a long journey filled with a lot of battles. Some of the monsters that will try to take your life will be: Fallen Soldiers, Fallen Firemages, Demonic Serpents (they like to suddenly emerge from the ground), Stygian Crawlers (they're small spiders), Heralds of Pestilence (you've fought them before) and Colossal Golgors (you should already know them as well).

Keep pushing until you've encountered a group of Demonic Summoners. It's crucial that you eliminate them as soon as possible, because otherwise they'll summon more demons to the battlefield.

Your current objective is to locate a passageway leading to the Tower of the Damned Level 1. The journey will be interrupted by a new vision of Azmodan.

Once you've started exploring the Tower of the Damned Level 1 you'll have to be ready to engage new types of monsters aside from the ones you already know. Hulking Phasebeast seem to pose the biggest threat. You should also be on a lookout for a new waypoint.

The location you're currently exploring has an oval shape and you will be constantly moving down. The passageway to the next area can be found at the bottom of the staircase, however before you get there you'll take part in a lot of fights, including the ones with Succubuses which can burden your team with curses.

You'll soon reach Tower of the Damned Level 2. Cydaea will start talking to you here and she'll be your next main opponent. Continue using the stairs, killing Hulking Phasebeast and other demons along the way. Eventually you'll get to a new passageway.

Once you've reached the bottom of the Tower of the Damned you'll enter a location named Heart of the Damned. Continue moving downwards. Cydaea will appear near the Sin Heart. She can effectively slow you down and spit poisonous projectiles which give birth to smaller spiders. Don't count on ending this battle quickly, because Cydaea will soon flee.

Kill the Daughters of Pain

As I've mentioned, Cydaea will flee and she'll leave you to "play" with her daughters - a group of Succubuses. Once these monsters are dead there will be nothing else stopping you from destroying the first heart.

Destroy the Sin Heart

Destroy the first heart. It doesn't pose any threat and it has a small energy bar.

Find the Tower of the Cursed

Destroying the first heart will open a new passageway. Head forward and continue moving until you've located a passageway leading to Arreat Crater Level 2.

Search the area to locate a waypoint. Reaching the second heart will be similar to finding the one which you've already destroyed. Arreat Crater Level 2 has an almost identical structure to Arreat Crater Level 1 and it's occupied by well-known monster types. You'll have a chance to watch a new vision of Azmodan along the way and eventually you'll get to the Tower of the Cursed Level 1. There's another waypoint in this location. Start using the stairs again, heading downwards. Your final objective is the Tower of the Cursed Level 2.

Once you've reached the bottom of the tower you'll have to defeat new demons and locate a passageway to the Heart of the Cursed. Notice that you aren't allowed to use a town portal spell here, so make sure to take the trip to the city before entering this area. Continue your march until you've located the heart and Cydaea.

Kill Cydaea

You already know what Cydaea is capable of, but here's a quick reminder: she can deploy a web which slows you down and she can spit poisonous projectiles. You also have to acknowledge the presence of smaller spiders that will be helping her.

Destroy the Sin Heart

Once you've killed Cydaea you'll be allowed to focus on destroying the second heart. Doing this will unlock the passageway to the next location. Head down and locate an entrance to The Core of Arreat.

Kill Azmodan in the Heart of Sin

There's a new waypoint in The Core of Arreat and you should also know that this is the last area you'll explore before taking part in the final battle of Act 3. Eliminate new demons, moving towards a passageway leading to the Heart of Sin. Proceed forward here and you'll soon enter a much larger room where Azmodan will already be waiting for you.

Azmodan has several types of attacks. The most common attack is about casting huge fireball at your team. The fireballs move rather slowly, however they won't be flying in a straight line. Instead they'll be homing in on your position and only if you continue to successfully evade them for more than a few seconds they'll explode. If you fail and get in contact with them you'll receive severe fire damage.

The boss also likes to "bombard" the area with dead bodies and you can receive damage if you get hit by one of them. The best way to avoid injuries here is to observe what's happening on the map, because a circle will appear on it soon before an area of the battlefield will be bombarded, giving you time to move away.

Another one of Azmodan's attacks is about creating black circles that are filled with the power of hell and expand over time. Make sure to stay away from them, because otherwise you'll receive massive injuries. The best tactic here is to start running towards the opposite edge of the battlefield, hoping that the black circle won't catch you.

Demon Gates may appear on the battlefield during the battle and Azmodan's Servants will be able to use them to join the fight. It's not a big threat, however you should be destroying the gates each time you notice them. The last one of Azmodan's attacks is a ray of fire and the boss can use it to inflict damage from a larger distance.

Killing Azmodan requires some time. Be patient, avoid his attacks as much as you can and look for opportunities to perform your attacks. Defeating this boss is rewarded with tons of treasures.

Get the Soul of Azmodan

The deal is the same as with the battle with Beliala from the previous parts of the game, because you'll be forced to get Azmodan's soul. As soon as you've clicked on the soul Adria, Tyrael and Leah will show up here. Leah will perform the ritual to imprison the soul within a Black Soulstone.

Return to the Bastion's Keep Stronghold

Use a town portal spell to return to the Bastion's Keep Stronghold.

Talk to Lieutenant Lavail

Lieutenant Lavail should be standing next to the town portal you've created. Talk to him and he'll give you new orders.

Enter the Armory

Proceed to the Armory.

Go to the Keep Tower

You won't encounter anyone here when you'll enter the Armory. Follow the blood trails to the Bastion's Keep Watchtower. You'll soon learn all the truth about Adria's betrayal and about Leah being used by Diablo.

Enter the Portal to Heaven

Make sure that you've completed all events, as well as visited the merchants and the blacksmith. Step through the portal to end this act and to advance to the last one.