Blackreach (Skyrim)

Blackreach is a large underground cavern found in the Tower of Mzark, filled with glowing mushrooms and Falmer. It can also be accessed from Mzinchaleft Gatehouse via the Dwemer mechanism in the final room to your left when facing the door out.

Blackreach was originally a Dwemer city.

Items of Interest

 * Several Geode Veins can be found here, which produce soul gems (Petty to Black) or random ore.
 * 2 Ebony Vein - 1 Between the Pump Station and 2 Falmer huts; Almost directly under the balcony from the pumping station. The only other known one has been found far south of the Debate Hall and slightly due east from 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.
 * Gold Vein - Under a bridge
 * Moonstone Vein - Near the Gold Vein
 * Corundum Veins
 * Quicksilver Veins
 * Crimson Nirnroot
 * Falmer Armor by a small waterfall near the Derelict Pump Station.

Enemies

 * Giant
 * TrollsDragon_blackreach.jpg
 * Falmer
 * Chaurus
 * Wispmother
 * Dragons
 * Dwarven Spiders
 * Dwarven Sphere
 * Dwarven Centurion

Blackreach contains Crimson Nirnroot. Harvesting a Crimson Nirnroot will start A Return To Your Roots.

The dragon Vulthuryol can be located here.

Locations in Blackreach
From Blackreach one can reach the following areas:
 * Alftand Cathedral
 * Raldbthar Deep Market
 * Mzinchaleft Gatehouse
 * Tower of Mzark.
 * Great Lift at Mzinchaleft
 * Hall of Rumination
 * Debate Hall
 * Pumping Station
 * Silent City Catacombs

During the main quest you need to retreive the Elder Scroll in order to go back in time to learn the long lost Thu'um of Dragonrend created by the Nords to defeat Alduin. There is a tower at the end of Blackreach which contains the Elder Scroll. The tower does not have any enemies although there is a simple puzzle to get the Elder Scroll off the ceiling in order to grab it. When you exit the tower through the alternate exit behind the puzzle room, you'll appear out just southwest of the dwemer fort entrance.

There seems to be a bug in Blackreach when the main questline gets to this point (on the PC version). The marker indicates an apparently impossible to reach second floor door in the corner of the central city of the zone, but that's not where the quest item is. You actually need to go pretty far from that marker and up one of the several elevator lifts throughout the zone. It's the elevator lift just past the giant waterfalls area.