A Conductor is an item that is only used in the Creature of Fenkenstrain quest. It is obtained by melting a silver bar in a furnace with a conductor mould in the player's inventory. This requires level 20 Crafting. It is used to repair the lightning conductor upstairs in Dr Fenkenstrain's castle. Players can make these after the quest; however, they are useless once the player has completed the quest. Additionally, after the quest, the mould becomes unobtainable.
Considering that the Creature of Fenkenstrain is a parallel of Mary Shelley's Frankenstein, it is highly likely that the conductor is meant to animate the Creature of Fenkenstrain through the use of electricity.