Numidium

The Numidium is a fictional colossal humanoid golem from The Elder Scrolls; both video games the Elder Scrolls II: Daggerfall and the Elder Scrolls III: Morrowind involve the Numidium, or at least its concept, as a central plot element in each games' story.

First Numidium
The Numidium was constructed by Dwemer artisans during the First Era, and intended to serve as a god of sorts for the Dwemer people, with many accompanying theories that it was built to allow for Mortal Plane transcendence. The original power source was the Heart of Lorkhan, which the Dwemer had enchanted using Kagrenac's Tools, Keening, Sunder, and Wraithguard.

It was first used in the Battle of Red Mountain, when Chimer forces assailed the Dwemer stronghold and presumably captured by the Chimeri forces after the mysterious disappearance of the Dwemer. Rumor has it that as part of the deal the Tribunal made with Tiber Septim, the Numidium was gifted to the Empire in return for a large degree of sovereignty to be granted to Morrowind. To operate it, the Emperor ordered his Imperial Battlemage, Zurin Arctus, to construct a control device which would be known as the Totem of Tiber Septim. As the deal did not include a power source, a new one called the Mantella was created, infused with powerful life energies.

Subsequently, it was used by Septim to conquer Tamriel until according to legend, it was used to oppress even neutral Tamrielic royal families, in an attempt to get rid of those that were not absolutely loyal to his rule. Zurin Arctus, enraged, attempted to halt the Emperor's use of the Numidium. In the ensuing chaos the Totem was lost, and Numidium was shattered.

In The Elder Scrolls II: Daggerfall, the player eventually recovered the Mantella at the end of the main quest. After the discovery, the Numidium was activated by an unknown personage. As a result, a "Dragon Break" (a spacetime anomaly) occurred. Subsequently, the multiple endings of Daggerfall occurred simultaneously. As a direct result, the major powers in the Iliac Bay region lost their strength, preventing a major war, Orcs became citizens of the Empire, the King of Worms became a new god, and the Underking died. The Numidium was completely destroyed as a result.

Second Numidium (Akulakhan, Anumidium)
The second Numidium (AKA Anumidium, or Akulakhan) is a reconstruction, of sorts, of the first Numidium; as detailed near the end of The Elder Scrolls III: Morrowind, it is powered by the Heart of Lorkhan, a powerful magical artifact in the Elder Scrolls universe. Its construction was overseen by the antagonist Dagoth Ur. He states that his goal is to cover the entirety of the world with his Blight, a deadly disease that poison Dagoth Ur uses to both infect, convert and control, citizens of Morrowind, so all mortals could be connected to the Heart and be controlled by Dagoth Ur. The protagonist of the story, the Nerevarine, prevents the completion of its construction, however, by defeating Dagoth Ur and destroying the Heart of Lorkhan; afterwards, the second Numidium literally fell apart.