The old capital is still crawling with Scourge. Packs are dense and patrols are long, so pulling carefully and tracking patrols is most of the fight. It is not a single corridor: there are several ways through, including passages that look blocked on the map. The numbers follow a first-hand beta run - Captain Truman on the brick path just north of the entrance (Alliance quest), down the east road to the spider area (Witherfang), south to the Baron, west along the southern road to the hidden boss at the fireplace (Viktor the Vile), north to the hidden boss from the doorway wave event (the Abandoned), further north to the foggy skeleton area (Bjork), and south to the purple rune in a dead end (Rath'mael).

Before you go

Witherfang patrols the large open room in the spider area east of the entrance, adds in tow. Watch her route before you pull anything.
Undead packs are tight; assign crowd control and interrupts in advance.
A poison dispel makes the Witherfang section much easier.
A standard tank/healer/three-DPS group is the safest setup, and at low level it pays to take one pack at a time.
Levels 17-20 are recommended. Rath'mael is level 20, so going in too early makes the end rough.
Market Street is a gauntlet of skeleton and ghoul swarms - strong AoE speeds it up a lot.
The Crest of Lordaeron that starts the quest of the same name does not spawn in a fixed place. Check the floors of the buildings you pass and pick it up if you see it - the Alliance take it to Lady Dena Kennedy in Stormwind, the Horde to Oran Snakewrithe in Undercity, for a Small Sack of Gems.

Dungeon map

Route

1
Captain TrumanNPCskippable
Turn left (north) as soon as you step out of the entrance and he stands on the brick path, not the grass. He gives and takes the Alliance quest Abominable Creatures - kill the Baron and bring back his head.
- Pick up “Abominable Creatures” here.
2
Lv 17WitherfangBoss
Head east from the entrance into the spider area and the level 17 spider sits in the middle of a large open room, ringed by spiders. The packs on the way and in the room are level 14-16 spiders and broodlings. She patrols far along the first long hallway with one Spider and two Broodlings (the map number is where she was killed), so clear the leftover packs while she is away and pull her when she comes back. She has no notable abilities beyond fast melee - the danger is the three adds she brings from the start. She puts Leech Poison on the tank, so cleanse it if you can. The Highly Toxic Strain for the Horde quest The New Plague comes from her. Afterwards, head south down the corridor.
- Objective for “The New Plague”.
See this boss's drops →
3
Lv 17The Butcher(The Baron)Boss
South of Witherfang's room, pass under the stone arch into a big room where the path splits. Go west through the wide opening in the stonework - the spiders give way to skeletons - and he is at the end of it; you can also keep going south past banshees and skeletons. In game this boss shows up as "The Baron"; "The Butcher" is only what the client's encounter table calls it (the same thing as the Hall of Thanes' Infurnus showing up as Magmatus). Think Patchwerk from Naxxramas: a huge abomination whose melee hits very hard. He uses Knockout, which takes close to half the tank's health and stuns them, a knock-up on the tank and a frontal Cleave. He can be stunned, so line up your stuns, and pick an off-tank to hold him while the main tank is stunned. He often jumps off the tank onto other party members, so DPS should ease off. His head starts Abominable Creatures for the Alliance and Unending Torment for the Horde.
- Objective for “Abominable Creatures” and “Unending Torment”.
See this boss's drops →
4
Lv 19Viktor the VileBossskippable
The hidden boss. After the Baron, follow the southern road all the way west to Viktor's fireplace beside a round tower. Light the fireplace and five waves of enemies rush in back to back, with Viktor the Vile arriving as the sixth. A beta bug where he never appears after the waves has been reported. He hits very hard in melee and applies Leech Poison, but the non-stop waves before him are the hard part: the tank needs strong AoE threat and the healer has to manage mana, so go in with health and mana topped up.
See this boss's drops →
5
Lv 18The AbandonedBossskippable
Northeast of Viktor's fireplace there is a hexagon-roofed structure - it is a passage. Go through it and north to the doorway where the Abandoned appears. The Abandoned is a hidden boss summoned by an event, so he is not standing there from the start: when the group steps into the doorway, the knight statue in the small room on the left glows purple and the event starts: three waves of enemies rush in, and with the fourth this level 18 ghost floats down to fight. You have to take the waves too, so go in with health and mana topped up. The Ghostly Citizens are non-aggressive, so leave them alone. He fights mostly in melee and wears Frost Armor that slows melee attackers. He roots everyone nearby for 8 seconds with a large Frost Nova and casts Life Drain, which can be interrupted or stopped with a stun.
See this boss's drops →
6
Lv 19BjorkBoss
Keep heading north from the Abandoned's doorway into the foggy skeleton area in the northwest of Market Street, on the west side of the dungeon - a gauntlet of skeleton and ghoul swarms that is easy with strong AoE. A level 19 gigantic undead troll roams here; one group went in through a building door, climbed the stairs to the walkway above to spot him, then jumped down. It is packed with Skeletal Mages and ghouls, so clear packs while avoiding him until you have room to fight. He is slow but hits hard, and puts up a 3-second Anti-Magic Shell like a death knight, so hold your casts while it is up. He also knocks the tank back, so tank him against a wall.
See this boss's drops →
7
Lv 20Rath'maelBoss
After Bjork, push through the remaining ghoul packs down the east side of the pools and keep going south to a dead end east of the hexagon-roofed structure, where a purple rune sits inside a fence. The level 20 final boss stands on it (you can also kill him before Bjork). Pull him off the rune back into the area you just cleared for room. His melee is fairly strong and he pulses area damage around himself (hard to avoid in melee), but the real danger is his Flamestrike. Guides disagree on whether to interrupt it or to dodge it and stun him, so set an interrupt order and step out of the fire right away if one is missed. Drop records show him dropping Blueprint: Fermenter almost every time. The Wrath of Rath'mael from Brill is the kill quest.
- Objective for “The Wrath of Rath'mael”.
See this boss's drops →

Dungeon quests

Abominable CreaturesLevel 21Accept at 15Alliance
Collect the Head of the Baron in the Ruins of Lordaeron and bring it back to Captain Truman.
Bloodied InsigniaLevel 22Accept at 15Alliance
Collect 10 Bloodied Insignias and take them to General Marcus Jonathan in Stormwind City.
Crest of LordaeronLevel 22Accept at 15Alliance
Return the Crest of Lordaeron to Lady Dena Kennedy in Stormwind City.
Remember That I Love YouLevel 22Accept at 15Alliance
Bring the Blood-Stained Letter to Orphan Matron Nightingale in Stormwind City.
Unending TormentLevel 21Accept at 15Horde
Deliver the Abominable Head to someone within the Undercity.
A Frightened RequestLevel 22Accept at 15Horde
Investigate the disappearance of Edward Heartweaver in the Ruins of Lordaeron.
Crest of LordaeronLevel 22Accept at 15Horde
Bring the Crest of Lordaeron to Oran Snakewrithe in Undercity.
Light's JusticeLevel 22Accept at 15Horde
Collect 25 Intact Limbs within The Ruins of Lordaeron for Morbin Lightbane in the Undercity.
The New PlagueLevel 22Accept at 15Horde
Collect the Highly Toxic Strain from Witherfang in Ruins of Lordaeron for Theodore Griffs in Undercity.
The Wrath of Rath'maelLevel 22Accept at 15Horde
Kill Rath'mael in the Ruins of Lordaeron for Deathguard Kristof in Brill.

See the quest reward items →