The Eclipse was originally designed as a sword that was part of the Daedric god Karavicus Vail. Due to a design error, or because Karavicus Vail was once trapped in the sword, it gained self-awareness, eventually breaking free from Karavicus Vail's control and creating a body for itself. But it remained trapped in the realm of Karavikus Vail until a deal was struck with the Dunmer mage Vuhon to provide the energy to create the floating city of Umbriel.
Initially, at the behest of Karavikus Vile, the witch Narnla Val (who is said to be Sheogorath in disguise) created the Eclipse to harvest mortal souls. To stabilize the sword, Karavicus Vile imbued it with part of his own essence. This essence will transcend the will of the bearer, making them driven by it. According to the memories of some holders, their life is to constantly satisfy their desire to fight. Some bearers are even named after the sword.
Over time, perhaps due to design errors by Karavicus Vile and Narnra, or perhaps from harvesting too many souls, the sword gained a sense of itself. It "cut a chunk" off Karavicus Vile, making itself as powerful as Karavicus Vile, while Karavicus Vile himself was severely weakened. In the end, Karavikus Vail used his entire realm to fight against the Shadow, confining it to its own realm. The Eclipse Shadow hid, waiting for a valuable holder (host) to appear.
The Shadow Sword can change shape, but always appears as a sword, absorbing the life and stamina of those it strikes.
In 3E 427, an orc warrior shadow was discovered on the hills outside the settlement of Suran on Vvardenfell. The Orc's only wish is to die in battle, but no one can defeat him. At his request, Nerevarin defeated the orcs in battle and captured the Eclipse. Later that year, the sword came into the possession of Torasa Aram and was displayed in the Museum of Mourn. At some point later, the sword came into the possession of a wood elf named Lenwin at Pell's Gate in the heart of Cyrodiil. She became bloodthirsty and began calling herself the Eclipse. .
In 3E 433, Karavikus Vel sent the hero Kovacs to retrieve the Eclipse. Babas advises the hero not to bring the sword to Karavicus Vile, foreseeing that it will bring destruction to Karavicus Vile. But the hero still returned it.
The returned Shadow broke away from the sword and tried to escape from Karavicus Viel's domain. In the process, he cut off a large portion of Karavicus Viel's energy, severely weakening the Daedra. Eclipse took the form of a man with many eyes and hid in a city on the edge of Karavicus Vile's realm to avoid being trapped in the sword.
In the early Fourth Age, Shadow Eclipse discovered that through the Ingenium, when Vivec mysteriously disappeared, the power that kept the meteorite Baal Daur from falling into the city was weakened. In order to keep it afloat, Vivec The people in the city designed a mechanical engine called genius, which uses souls as its power source, so that ten slaves must be sacrificed every day to maintain its operation. The souls pouring into the realm create a gap. If the gap is big enough, the sword body will be able to be broken. Throw it out to reduce the threat to yourself. When the Ministry of Truth exploded, the talent was destroyed. Eclipse threw the sword through the gap, and eventually landed in Vivec City, where it was picked up by Elhul Sathil, who went crazy as soon as he touched the sword. At the same time Izamar Sur and Vuhon were drawn into the realm of Karavicus Vile.
Eclipse captured Izamar Sur and U'Hon, and U'hon promised Eclipse that if he survived, he would build a new Ingenuity that would tear apart Karavicus Vile's domain and allow Eclipse to escape. . Shadow Eclipse agreed, so Uhong built a second Talent and created a floating city, Umbriel. They merge into one person, Uhong/Eclipse, who can control Hell City, and those absorbed souls will power them. Hell City even wanders in many realms and areas outside of Annihilation.
In 4E 48, through the Theist Tree, Uhon reached an agreement with Hierem, the priest of An-Xileel (an organization that ruled the Black Swamp in the early Fourth Era), to merge Hell City and West However, due to the restrictions of Karavicus Vile, they could not leave the floating city. Eclipse and Uhun tried to make the city sail to the White Gold Tower to complete the battle with Karavicus. The Separation of Wikus Vail. To stay safe, they decided to head north into Morrowind to find Eclipse's sword, as it could be used to destroy Eclipse and the Gifted.
Sur and Prince Attrebus Mede defeated El'Hul and obtained the Shadow Eclipse's blade, using it to teleport to the realm of Karavicus Vile. Karavicus Vile and his realm were weakened as the Eclipse stole his energy. Prince Atrebus Mede attempted to wield the sword, but was unable to control it without the Shadow to stabilize it. Prince Atrebus Mede negotiated with Karavicus Vile, agreeing to help him regain his lost power in exchange for passage to the Imperial Capital.
Sur and Prince Atrebus Mede entered the Hell City, and they found that Uhong's body was twisted, deformed, and became darker. Eclipse now fully controls Wu Hong's body, and Soul wields his sword in battle with Wu Hong. It had no effect on him, as his soul was within the Gift, and during the final battle, Prince Atrebus Mede was forced to use the Shadow's blade and throw it into the Gift. The Eclipse (sword) destroyed the talent and trapped the Eclipse (spirit) within the sword. This separated Eclipse Shadow from Wu Hong and also gave Wu Hong a fatal blow.
With the outer wards of Hell City destroyed, Karavicus Vile was able to enter the Floating City. He took control of Prince Atrebus Mede and wielded the Eclipse to fight Sur. With his last breath left, Sur grabbed the hilt of Eclipse's sword, pulled himself to the blade, and struck him, allowing the prince to regain consciousness. With everything left on Soul, he jumped onto the orb of the genius, allowing himself, Eclipse, and the genius to melt together into a ball of black smoke that violently released lightning.
"When we arrived, there was someone - or something - waiting for us. But it wasn't Karavicus Vile. It was shaped like a man, very dark, with empty eye holes. It held a sword. As we lay there, it laughed and threw the sword into the crevice through which we came." - Izamar Sur.
In 4E 179, the Shadow Eclipse Sword mysteriously returned to Tamriel. The reason is unknown, and it may have returned to its original unconscious state. A treasure hunter named Cresitus fell into a hole in Skyrim and broke his leg. As a result, he uncovered the lost Nord ruins of Champion's Rest, which was once used as a gladiatorial arena. On the verge of death, Krestus dreamed that he was swimming in the black sea, and the Shadow Sword was calling him. Crestus wakes up to find the sword at his side and heals his wound. Over the next few days, the Shadow Sword whispered to him, longing for souls. Eventually, Krestus stayed in the ruins and began calling himself the Eclipse.
In 4E 201, a prospector from the Stone of Shur accidentally broke into Breath of Champions and encountered a "ghost" wielding a sword that spoke whispers. This ghost is actually the soul image of Eclipse, which can be separated from itself through will control. Later, Standal's vigilantes investigated the Champion's Breath and speculated that it was the effect of the Eclipse. The leader of the vigilantes, Guardian Casset, rushed here personally to fight against the shadow. Although the treasure hunter Krestus had powerful magic and was immune to physical damage, he was still defeated by the guardian Kaset who had the power of the magic ring. Seth defeated.
This is the situation.
So the question is, what is the relationship between the Holy Land of Evil Men and the Shadow Eclipse Demon Sword?