Quelaag's Domain

The spider witch's lair at the bottom of Blighttown. It holds the second Bell of Awakening and the Chaos Servant covenant.

Suggested level: 30–40

Bosses

Chaos Witch Quelaag: Stay at her side away from the lava spit and wait for openings. Fire does nothing to her. Maneater Mildred can be summoned.

Bonfires

Daughter of Chaos

Items found here

Helm of Thorns: Appears near the Fair Lady after you beat the invader Kirk, Knight of Thorns in all three of his invasions.
Armor of Thorns: Appears near the Fair Lady after you beat the invader Kirk, Knight of Thorns in all three of his invasions.
Gauntlets of Thorns: Appears near the Fair Lady after you beat the invader Kirk, Knight of Thorns in all three of his invasions.
Leggings of Thorns: Appears near the Fair Lady after you beat the invader Kirk, Knight of Thorns in all three of his invasions.
Toxic Mist: Buy from Eingyi for 25,000. He only sells after you've talked to him with an egg-infested head.
Great Chaos Fireball: Gift for joining the Chaos Servant covenant at the Fair Lady's chamber.
Chaos Storm: Reward for reaching rank 2 in Chaos Servant (30 Humanity offered in total).
Servant Roster: Buy from Eingyi beside the Fair Lady for 500 souls.
Soul of Quelaag: Dropped by Chaos Witch Quelaag.
Fire Keeper Soul: Drops from the Daughter of Chaos if you kill her (ends the covenant there).

Walkthrough: Blighttown and Quelaag's Domain

Move slowly: Blowdart Snipers shoot poison darts from the shadows.
Make a running jump to the post to reach the Iaito.
Light the Blighttown Catwalk bonfire.
Drop below where the Iaito was for Blooming Purple Moss Clumps, cross the swaying bridge for Humanity, then return to the bonfire.
Past the bonfire, beware the trap floor next to a soul: it collapses.
Climb up to take the Shadow Set.
Move into the next section, watching for a Blowdart Sniper on a high ledge.
Go down the longest ladder, deal with the sniper and grab the Eagle Shield.
Up top, shoot the Parasitic Wall Hugger from a distance; the Power Within pyromancy waits below it.
Squeeze through the hole in the wall and climb down toward the boss fog gate.
Turn back and drop down to grab the Whip.
Drop again and follow the walkways toward the swamp, killing another sniper on the way.
Next to that sniper lie the Wanderer Set and the Falchion.
The swamp slows you badly, so equip the Rusted Iron Ring before the bottom and dash to the bonfire.
Light the Blighttown Swamp bonfire and open the chest in its tunnel for a Dragon Scale.
The swamp floor hides the Pyromancer Set, the Poison Mist pyromancy, Large Titanite Shards, the Server and some souls.
Up the big branch that leads to the Great Hollow are the Plank Shield on a body and Twin Humanities behind a fake wall.
The Infested Barbarians hurling boulders drop the Great Club when slain.
Giant Leeches are a decent optional source of Large Titanite Shards and Green Titanite Shards.
Climb the waterwheel, take two ladders and circle the ledge to kill the Blowdart Snipers.
A ladder leads down to some dogs; past them lies a Fire Keeper Soul.
Return to the bonfire as a human. Maneater Mildred invades; kill her for the Butcher Knife and Humanity.
Defeat Chaos Witch Quelaag.
If you defeated Maneater Mildred, her summon sign is next to the fog gate.
Ring the second Bell of Awakening in Quelaag's Domain.
Go down, strike the illusory wall and talk to Eingyi. Answer yes so he steps aside; if you answer no, reload and try again.
Eingyi sells Poison Mist and Toxic Mist only after an egg-head in Blighttown infests you.
With 11 or more Intelligence, Eingyi gives you a Pyromancy Flame.
Eingyi can also upgrade your Pyromancy Flame.
Talk to the Daughter of Chaos and optionally join the Chaos Servant covenant.
As a Chaos Servant, offering 30 Humanity opens a shortcut into Lost Izalith.
Reinforce your Estus Flask here with any Fire Keeper Soul you hold.
Light the Daughter of Chaos bonfire, then return to the swamp bonfire.
Optional co-op around levels 25–40.
If Quelana of Izalith is in the swamp, she can upgrade your Pyromancy Flame and sell pyromancies.
On a second climb up the wheel, a thin branch off the first ladder leads to the Crimson Set, the Tin Banishment Catalyst and the Remedy sorcery.
At the very top of this shanty town lies the Key to New Londo Ruins.
The exit opens onto the Valley of Drakes; bring the Undead Dragon down from range with arrows or magic.
Head back to Firelink Shrine.
If Lautrec is still alive he has now killed Anastacia. Pick up the Dingy Set and the Black Eye Orb from her cell.
The Crestfallen Warrior has new things to say; chat with him.
Talk to Griggs of Vinheim to buy sorceries (10 Intelligence needed).
Talk to Laurentius of the Great Swamp for a Pyromancy Flame, upgrades and pyromancies.
Talk to Petrus of Thorolund to buy miracles.
Before they set off, speak with Reah of Thorolund and her guards Vince of Thorolund and Nico of Thorolund.
Kingseeker Frampt now sits by the bonfire; he swaps items for souls.