Diablo 3 Walkthrough Part 31: The Imprisoned Angel

Go through Leoric's Manor Courtyard. There are Dark Cultists waiting to ambush you in this zone, you can either kill them or make a run to the exit. Enter Leoric'c Manor. Your quest log updates:

Trailing the Coven
Explore Leoric's Manor

There will be more Dark Cultists at the entrance, as well as Dark Berserkers. There could also be a Dark Cultist Boss here (yellow), such as Malifant the Damned or Scathach Filthpit (Waller). Kill them, and find a green item - Orders from Maghda, which is added to your journal. Those orders speak of Leah, the Child of the witch Adria, who is hiding in the deserts of Caldeum. There are also pieces of Leoric's Journal spread around the manor. Head towards the stairs. A Dark Vessel is performing some sort of Ritual, and is about to transform. Kill it before it changes to an Unholy Thrall, which will be harder to kill.

Climb the stairs, and explore the corridors of Leoric's Manor. Eventually, you reach the big manor doors Enter a room and watch from the Balcony. Maghda is conferring with the members of her Coven. You overhear the cultists say that the strange is unstoppable, no mortal could slaughter their brethren with such ease. Head down and attack the cultists. These include Dark Summoners who summon Dark Hellions against you. Maghda orders the cultists to delay you while she prepares your demise in the depths bellow. Kill all the cultists.

Interact with the Wounded Man. He tells you that the coven did horrible things to them. You tell him that you are looking for the stranger. The wounded man tells you he saw the man with the golden eyes. Maghda took that man into Leoric's old torture chambers, below us. This starts the next quest:

The Imprisoned Angel
Enter Halls of Agony Level 1

Exit through the door behind the wounded man. There is a waypoint here, in case you want to go back to town and replenish your supplies. When you are ready, head down the stairs and enter the Halls of Agony Level one.  There is a unique enemy here: Cultist Dark Inquisitor (Master of Pain), who is a Dark Summoner Boss with more health and power than a regular Dark Summoner, so be prepared to face him.

There are new types of undead monsters in this level, incuding Bloated Corpses and Disentombed Hulks. There are many torture tools, torture rooms, and a lot of blood on the floor, indicating that this area is a very cruel torture chamber. As you delve deeper into this dungeon, you also come across an Iron Maiden spawning Voracious Zombies. Make sure to destroy the Iron Maiden to stop it from producing these zombies. There are also more Dark Vessels, who transform into a demon, the Unholy Thrall, if you do not kill them on time.

You can use the environment to your advantage - there are many traps, such as Spike Traps, spread throughout the Halls of Agony. If you lure the monsters underneath these traps, you can activate them and kill a big group of enemies easily.