Gauntlight

An enormous lighthouse of pale stone rising 115 feet from the ruins of Fogfen, with foundations extending nine levels deep underground. Gauntlight was constructed by the sorcerer Belcorra Haruvex as a vessel for eldritch power drawn from the place where Nhimbaloth once brushed against the mortal world. Its walls are infused with otherworldly energy, and the lens at its apex can focus that power into a beam of pale blue light.