Valuable tools

Exploration Stage: Witches' Abode
From: Conductor
Description: But even with that device, we were unable to find a portal to get out of the city. We even tried to improve it with an artifact... Speaking of artifacts, there is one more thing we tried. Can you bring me the golden one there?
Completed: This was a very ordinary train nail, but the artifact turned it gold. It's like a magic wand, instantly repairing the tracks.