Diablo 3 Act III Random Dungeons Guide

This part covers the locations of the Random Dungeons that spawn across Act III. The main goal of this guide is to help you get the "Oh The Places You'll Go" achievement, but we also list any lore books found in those dungeons for achievements such as Beastmaster of Arreat , Primary Sources, Espionage and Historian of Arreat, as well as specific monster monsters for achievements like Keep it Rare. If you are interested in Resplendent Chests specifically, we mention when a dungeon contains one. We also mention events that take place in those dungeons.

Act III Random Dungeons

Battlefield Stores
Location: The Battlefields (Look for stairs leading down)
2-Level dungeon (Battlefield Stores Level 1, Battlefield Stores Level 2)
Monsters here include undead such as Skull Swords, Skull Summoners, Skeletal Marauders, Dark Skeletal Bowman, and Skull Cleavers, as well as beasts such as Winged Moloks and Demonic Hellflyers. Sometimes there is a unique (yellow) elite mob such as Torment the Hellion (Mortar) or Hex Greedgallow (Molten).
You can sometimes find a Treasure Bandit here.
Lots of crates, sturdy barrels to smash, and dead guardsmen carrying some gold.
A green lore book can possibly drop here, "The History of Bastion's Keep"
One of the chambers in the second level holds a Resplendent Chest.

The Barracks
Location: The Arreat Gate (Near the catapults)
Dungeon with two levels (The Barracks Level 1, The Barracks Level 2)
This dungeon has demons such as Fallen Overlords, Fallen Maniacs, and Fallen Grunts, and beasts such as Fallen Mongrels.
Level 2 has an event: Blood Ties, which requires you to help another guard find the missing guard of the keep. Then, talk to the found Guard of the Keep.
A Resplendent Chest potentially spawns in this area

Bridge Stores
Location: Rakkis Crossing
Not much loot, but Vidar the Collector (Merchant) can be found here. He sells good quality magic and rare items.

Caverns of Frost
Location: Fields of Slaughter
Two levels: Caverns of Frost Level 1, Caverns of Frost Level 2
Enemies are include Wintersbane Huntresses, Wintersbane Stalkers, Icy Quillbacks
A Resplendent Chest can be found at the lower level of the dungeon.

Cryder's Outpost
Location: The Battlefields
Dungeon with one level. Located near the center of the Battlefields.

Fortified Bunker
Location: The Arreat Gate (Near the catapults)
Two level dungeon (Fortified Bunker Level 1, Fortified Bunker Level 2)
Use the Control Wheel to lower the bridge leading you deeper into the dungeon
Monsters here include: Demon Raiders, Winged Moloks, Demonic Hellflyers, Demonic Tremors, Plague Swarms, Tormented Stingers. Sometimes a yellow enemy can be found here, such as Gapewound the Disemboweled (Waller).
Shoot Lantern Oil Barrels to cause damage to enemies.
Sources of Treasure and loot are: Dead Guardsman, Supply Cranes, chests, Sturdy Barrels
There is a Resplendent Chest in level 2 of this dungeon.

The Forward Barracks
Location: The Battlefields
Medium sized, One level dungeon
A Shrine and Healing Well are usually present in this dungeon.
Demons such as Fallen Grunts, Fallen Overlords, and Fallen Prophets.
Often has a Resplendent Chest

The Foundry
Location: The Battlefields (Break a couple of barricades and go down the stairs)
Dungeon with two levels in it (The Foundry Level 1, The Foundry Level 2)
Lots of Demon Raiders, Demon Troopers, and Demonic Tremors, also Soul Rippers and Succubus. Sometimes a yellow elite enemy such as Malice the Damned (Extra Health Jailer) and Felyron Viletongue (Plagued Frozen)
A Wandering Merchant, Halmin the Alchemist can also be found here sometimes. He sells all sorts of potions and dyes including Resplendent Health Potion, All-Soap's Miraculous Dye Remover, Tanner's Dye, Autumn Dye, Desert Dye, and Ranger's Dye.
A Treasure Bandit also spawns here sometimes, dropping gold and even magic and rare items when killed.
Make sure to explore all of Level 2 to find the Resplendent Chest there.
Sometimes you see the Vision of Azmodan here, followed by an attack from Shadow Vermins.

Icefall Caves
Location: Fields of Slaughter
Two levels of caves (Icefall Caves Level 1, Icefall Caves Level 2)
Some monsters unique to this zone are the Great Horned Goliath, Possessed. Also there are Frostbiters and Frostclaw Burrowers here.
There is a easter egg here: The Lich King Helm, which can be seen behind one of the cavern's walls.

The Underbridge
Location: Rakkis Crossing
Mid-Sized dungeon with one level
Mobs here include Blood Clan Warriors. A unique yellow elite monster such as Ezreth, Patron of the Mad (Nightmarish) can also sometimes be found wandering the dungeon.
A Treasure Bandit spawns here sometimes. If you kill it, it will drop some magic and/or rare items.
There is a good chance of finding a Resplendent Chest here as well.