The hoist is a tool that the Carliners implemented in the Formorgar Mines while doing the exploration and extraction of mineral goods in there. It consists in a complex machinery that allows things with to be transported at a greater ease in between the floors. Although useful, the manuals for the operation of the mines have been lost when the Formorgar Mines were forgotten with the frostheart spire shattering. It is said that some of the miners that were victimed by the sudden freeze carried the manuals for the hoist operation.
Here you can see the entrace of the Formorgar Mines and the Hoist localization:
See the spoil of the Formorgar Mine Hoist Quest.