- Main article: Rocketspark and Borka
Railmaster Pauli Rocketspark is the first boss of Grimrail Depot. He uses his former employer Siegecrafter Blackfuse's technology to help power the Iron Horde. He is encountered with his savage assistant Borka the Brute during the Rocketspark and Borka encounter.
Pauli Rocketspark is the new head of the Blackfuse Company following Helix Blackfuse's demise in Orgrimmar. Remaining true to his company's patron, Garrosh Hellscream, Rocketspark was the one responsible for the construction of numerous technological inventions destined to be used in the Iron Horde's arsenal, including the armored train equipped with a powerful railgun, Grimrail.
- He collects Hearthstone cards as a hobby.
- He seems to have little more than contempt for his dimwitted assistant, despite Borka's good intentions.
- Pauli Rocketspark is voiced by David Lodge.
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
It is possible that he crossed the Dark Portal when the Ironmarch force took control of the portal and the Blasted Lands.