Blackreach (Skyrim)

Blackreach, or Fal Zhardum Din in Dwemer, is a large city in a massive underground cavern found under the Tower of Mzark, filled with glowing mushrooms and Falmer. The cavern encompasses the area between three Dwemer cities - Alftand, Mzinchaleft, and Raldbthar - and connects them.

Like all the other Dwemer cities, it now lies in ruin, overrun by Falmer, Chaurus and Glowing Mushrooms. The Glowing Mushrooms here are exponentially larger than those found elsewhere, with stalks taller than buildings. The ceiling of the entire cave system glows with blue bioluminescent lights, and massive glowing vines that hang down. There is a teal fog within Blackreach that makes grasping the size of Blackreach difficult, and mushroom spores that float throughout the air. Massive geode stones and Geode Veins also dot the ground, and the pools of water found within are an almost entirely opaque teal.

Typically, this location is encountered as part of the Elder Knowledge quest. It is possible to discover it earlier, by initiating Discerning the Transmundane.

History
Sometime after 1E 221, the Dwemer of Skyrim discovered a considerable amount of raw mineral with magical properties, which they referred to as Aetherium. The Dwemer quickly built four new cities, which were Arkngthamz,  Mzulft, Raldbthar, and Bthar-zel (now known as Deep Folk Crossing), which would work together to research this new mineral and develop new technologies forged from Aetherium.

The roles for this project were spread out between the four cities; Arkngthamz would serve as the project command center and the primary research center, Raldbthar (which happened to be located directly above Blackreach) would deal with mining operations, and Mzulft was used as a storage site. It is unknown what role Bthar-zel undertook in this project. The city of Bthalft was not a part of the alliance, but it was used as the site for the Aetherium Forge, a large, magma-fueled forge which would be used to create new, extremely advanced weapons, armor, tools, and other items combining the great metalwork and engineering skills of the Dwemer and the innate magical powers of Aetherium.

At first, the project was successful, with the alliance of the four cities bringing peace, harmony and scientific and technological advancement to the Dwemer. However, after three years, the four cities began to want control over the Aetherium, the Aetherium Forge, and the incredible items it could produce.

Sublocations
The following areas can be reached from Blackreach:

Entrances
* Before using these locations as exits, they must first be entered from the surface and unlocked. If attempting to leave Blackreach using them, the Dragonborn will encounter impassible barriers unless they have first been unlocked from the other side.
 * Tower of Mzark: this is the initial point of entry into Blackreach, and is the only one available until the Dragonborn starts the Elder Knowledge quest.
 * Mzinchaleft * : once cleared, the Mzinchaleft Gatehouse contains a Dwarven Mechanism that, once activated, opens a spiral staircase in the floor around the mechanism. The mechanism can only be activated using the Attunement Sphere obtained from Septimus Signus, who lives at Septimus Signus's Outpost north of the College of Winterhold, during the quest Discerning the Transmundane. This leads directly to a door to Blackreach. Because the Mzinchaleft Gatehouse can be accessed quickly (once cleared) from Skyrim, using an unlocked elevator (the entrance is located on the road just northwest of Mzinchaleft), this location can be a fast, straightforward access point to Blackreach later. Inside Blackreach, it is labeled as Mzinchaleft Gatehouse.
 * Raldbthar * : located on the peak near Shearpoint (where the Dragon Priest Krosis is located). Once cleared, this also requires the Attunement Sphere to enter. Inside Blackreach, it is labeled as Raldbthar Deep Market.
 * Great Lift at Mzinchaleft: becomes accessible and appears on the world map after it has been used for the first time to exit Blackreach.
 * Great Lift at Raldbthar: becomes accessible and appears on the world map after it has been used for the first time to exit Blackreach.
 * Great Lift at Alftand: becomes accessible and appears on the world map after it has been used for the first time to exit Blackreach.

Locations inside Blackreach

 * Debate Hall: near a giant glowing orb in the approximate center of Blackreach.
 * Using Unrelenting Force on the orb outside the Debate Hall will summon the dragon, Vulthuryol.
 * Alftand Cathedral: when cleared, the Alftand Cathedral contains an entrance to and exit from the far northeast end of Blackreach.
 * Hall of Rumination
 * Pumping Station (Silent City)
 * Derelict Pumphouse
 * Silent City Catacombs
 * Farm Overseer's House
 * Silent Ruin
 * War Quarters
 * Reeking Tower
 * Sinderion's Field Laboratory

Quests

 * Elder Knowledge
 * Discerning the Transmundane
 * A Return To Your Roots
 * Seeking Disclosure

Alchemy ingredients
Because of the vast size of Blackreach, these figures may not be exhaustive.
 * With Dawnguard installed, this area is excellent for farming Chaurus Hunter Antennae, as there will be more Chaurus Hunters than standard Chaurus.
 * Bleeding Crown - 10
 * Blisterwort - 17
 * Chaurus Eggs - 32+ (Drops from the Chaurus in the area)
 * Chaurus Hunter Antennae - 20+ (Drops from Chaurus Hunters)
 * Daedra Heart - 1 Inside Sinderion's Field Laboratory
 * Crimson Nirnroot - 44+
 * Dwarven Oil - 0+ (Drops from the Dwarven Automatons in the area)
 * Falmer Ear - 0+ (Drops from Falmer in the area)
 * Fly Amanita - 2
 * Giant's Toe - 0-1 (Drops from Giant in the area)
 * Glow Dust - 4
 * Imp Stool - 3
 * Namira's Rot - 5
 * Spider Egg - 2
 * Troll Fat - 2
 * White Cap - 4
 * Wisp Wrappings - 1

Mining

 * Corundum Ore Veins - 14
 * Ebony Ore Veins - 5
 * There is one between the Pumping Station and two Falmer huts, almost directly under the balcony from the pumping station, by the Wispmother.
 * One is to the far south of the Debate Hall and slightly west of the top of the Derelict Pumphouse, behind the edge of the waterfall that splits on either side of the rock that has a Crimson Nirnroot sitting on the very tip.
 * Next to Sinderion's Field Laboratory.
 * Northeast of the Tower of Mzark, on a small island (not far from the tower's structure).
 * Due to the south of Debate Hall, and due east of the Tower of Mzark.
 * Geode Veins - 30
 * Gold Ore Veins - 2
 * Moonstone Ore Veins - 2
 * Orichalcum Ore Veins - 3
 * Quicksilver Ore Veins - 3
 * Note that with the abundance of Geode Veins here, this is an excellent place to collect many empty Soul Gems, as Geode Veins can yield anything from Petty Soul Gems to Black Soul Gems, as well as possibly various precious gemstoness, just like any other vein.

Books

 * 2920, MidYear (v6) (Skill Book - Heavy Armor): on a table west of the War Quarters building. The table is at the top of the short set of stairs near the lever that triggers the blade trap.
 * Sinderion's Field Journal: found in Sinderion's Field Laboratory on Sinderion's remains. Reading this book is one way to initiate the quest A Return To Your Roots.
 * Warrior: in a small dwarven house, Silent Ruin, on a stone chair with a pressure plate in front of it.
 * De Rerum Dirennis: on a stone desk inside Sinderion's Field Laboratory, next to a sample of Crimson Nirnroot.

Other loot

 * Blackreach is a great place to get lots of Soul Gems, if the Dragonborn is carrying a Pickaxe. Mining the Geode veins will yield random sizes of Soul gems from Petty to Black. This is also useful to raise the Enchanting skill by using the Soul Gems to enchant items or recharge enchanted weapons.
 * Falmer Armor: the chest piece can be found in a Falmer hut to the west of the entrance leading to Raldbthar Deep Market. Other pieces can be found on the Falmer in the area, depending on the Dragonborn's level.
 * Adept-level locked chest: inside Novice-level locked gate just to the west of the Raldbthar Deep Market entrance.
 * Master-level locked chest: just to the right of the Raldbthar Deep Market entrance on the wall, facing out into Blackreach.
 * There are many Dwarven Centurions with Centurion Dynamo Cores to collect within Blackreach, as well as other places where cores can be found. Leaving and returning after 3 days allows the centurions to respawn and be battled again.

Trivia

 * Blackreach is considered an outdoor area, despite being underground. This means that the Storm Call Shout and Summon Arvak both work here, and vampires will be weakened during normal daylight hours, although there is no daylight. Couriers may also spawn inside.
 * The scale in Blackreach is slightly smaller than on the surface. In other words, walking 1 mile in Blackreach is the equivalent of walking 1.3 miles on the surface.
 * Blackreach is mentioned in the book Dwemer Inquiries Vol III. On the second to last page, the author writes "The most reasonable translation ... I have managed to decipher is 'Blackest Kingdom Reaches', but I cannot imagine what that means." Also, on the sixth page of this book, the author explains that the same Dwemer phrase is found particularly on "ornate metal frames in the deepest reaches of the Strongholds Alftand, Irkgnthand and Mzinchaleft of Skyrim." Two of these Strongholds (Alftand and Mzinchaleft) connect directly to Blackreach.
 * There's a Dwemer Crossbow which can be fired with a lever near the entrance from Alftand Cathedral.

Bugs

 * There is a glitch that will not allow crossing of the bridge to the Elder Scroll. To fix this, delete the update data from game data utility, then re-update the game. This also fixes the framerate drops and seems to fix most of the glitches on the PS3 version.
 * Lifts to the surface can occasionally cause the game to effectively freeze on the loading screen, barring all actions apart from quick-loading.
 * Solution: Open the console, wait 5-10 sec, then close it.
 * This can also be prevented entirely by temporarily disabling autosaves on traveling, and then enabling them after using the lifts.
 * There is a Falmer tent near the Ralbdthar Deep Market entrance which will trap the Dragonborn inside it if it is somehow entered. The only solution seems to be loading a previous save, as Whirlwind Sprint, sprinting, jumping, or rolling do not seem to allow Dragonborn to leave.
 * On some occasions, it is possible to alter the weather/daylight in Blackreach by entering and exiting the gate in the north-western corner of Blackreach (follow the path up from one of the elevators). This may cause all of Blackreach to be as bright as a normal day outside, greatly improving visibility.
 * Occasionally, a levelled Falmer may fall from the sky upon leaving Sinderion's Field Laboratory. This may be due to a spawning error and has only been seen on Xbox 360.

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