The Necromancer's Amulet (also known as the Necromancer Amulet) is a legendary artifact created by Mannimarco. In appearance it is an exquisite amulet, often with a skull emblazoned upon it. It grants the wearer magical protection equivalent to plate armor, as well as the ability to regenerate from injury, resist mundane weapons, and absorb magicka and life force. The wearer also becomes wise beyond his years and far more capable in the School of Conjuration. This comes at a price, as the amulet can drain the wearer's strength, endurance, health and stamina. The artifact is popular among both thieves and mages. The amulet is unstable in this world, and is forever doomed to fade in and out of existence, reappearing at locations distant from that of its disappearance.
The amulet was uncovered by the Eternal Champion during the Imperial Simulacrum, in either High Rock or the Summerset Isles. In the events leading up to the Warp in the West, the amulet was recovered from an ancient lich by a knightly order in the Iliac Bay area. The amulet later fell into the hands of the Underking, who promised it as a reward for any who would return the Totem of Tiber Septim to him. Due to the Warp in the West, the fate of the amulet is unknown, although it may have been given to an unknown agent of the Blades. By 3E 427, the amulet had come to be owned by Arch-Mage Trebonius Artorius of the Vvardenfell branch of the Mages Guild. It was later claimed by the Nerevarine, although the circumstances as to how Artorius lost it are contradictory, ranging from the death of all the Telvanni councilors to the Nerevarine dueling for the title of Arch-Mage.
By 3E 433, the amulet had been transported to the Arcane University in the Imperial City for safekeeping. With the return of Mannimarco after his ascent to godhood, Caranya of the Council of Mages turned traitor and took the amulet and her supporters to the abandoned Fort Ontus, where she intended to return the amulet to its creator, making Mannimarco nigh unstoppable. The Champion of Cyrodiil uncovered Caranya's treachery and killed her, returning the amulet to Arch-Mage Hannibal Traven. By 4E 201, long after the dissolution of the Mages Guild, the amulet had been discovered, and lost again, by Calixto Corrium of Windhelm after he had been driven to madness at the death of his sister Lucilla. Attempting to bring her back to life, Calixto turned to necromancy and intended to use the amulet in his experiments. The amulet was found by the Last Dragonborn, who was investigating a string of murders in the city, attributed to a serial killer called "the Butcher". The Butcher was none other than Calixto, who was eventually discovered and brought to justice.
When threatened, the eternally paranoid Lady Syl would retreat to the ruined tunnels of Xirethard that run beneath New Sheoth and would equip herself with Dark Seducer armor and Nerveshatter. She claimed to have defeated many while wielding the hammer. Syl was killed by the Champion of Cyrodiil during the Greymarch of 3E 433, although it is unknown if she defected to the Forces of Order or if her death was part of the Ritual of Accession. In any case, Nerveshatter was claimed by the Champion.