The Blackfuse Company is a mercenary group comprised of goblins that specialize in constructing siege weapons, founded by the late Siegecrafter Helix Blackfuse. It provided advanced weaponry for the Kor'kron under direct order of Garrosh Hellscream, such as the Iron Juggernaut.
Blackfuse also repurposed Titan technology stolen from Pandaria in order to create a defense system protecting the Underhold's vault where artifacts plundered from the continent were stored.
During the Siege of Orgrimmar, many of their creations and members have been destroyed. However, their legacy will live on through the vengeance of Hellscream.
Several Blackfuse Company members have joined Garrosh Hellscream in Draenor, working with the Iron Horde by supplying the technology needed to build and maintain their infrastructure and siege weapons.
Their new headquarters are located within the Grimrail Depot, with some members also being part of the staff in the Iron Docks.