Lodestone of Darkness

Lodestone of Darkness is a Vampire Counts military recruitment building in Total War: Warhammer. An infernal lodestone is planted inside a binding circle, summoning the most powerful of all spirits as it glows.

Background
When a Lodestone is placed inside a binding circle, and a Necromancer recites words that haven't been spoken since the Fall of Nehekara, then the Wight Kings emerge from their burial mounds. Clad in the raiments of war, the wraiths leave their cairns and the Hexwraiths will gallop into existence, all drawn to the master that controls the lodestone.