Mainland scholars in Tamriel generally believe that the Storm of Sorrow is "Giant Supernatural Confluxes".
Like Dark Anchor, Abyssal Geysers and Dragonscours, they happen without much warning, leaving death and destruction in their wake. The energy generated by the storm is capable of killing many people instantly or turning them into near-conscious husks. Three witch spears must be planted in the storm during the ritual; each spear attracts a lost soul. All three spears need to be destroyed as quickly as possible to prevent the center of the storm from summoning a larger monster. In addition to a large number of enemies such as the Miserable and the Miserable Demon, the storm can also cause damage through red lightning. If you can't avoid it, you will die instantly.
"What alchemy materials are needed to release the storm of sorrow?" The Lord gently closed the book.
"There are three: Netherroot, Ritual Pikes, and Gray Reliquary." Dawn Warhammer Xili is the most competent librarian beside the lord. Completely worthy of the title: "I can get up to the master bed and get down to the study room; I can write notes and detect abnormalities; I can pick out flaws and spell out the whole chapter; I can lead a good team and dig out treasures; I can fight against bandits and fight Better than the gangsters.” Especially that kind of full happiness (?), which can only be tempered by frost and animal skins. The swollen and blooming Nord female warrior can fully accommodate and give to the lord.
Well, complete and full.
Lower root, a magical plant. It only grows deep in the isolated area of Blackfall, but its alchemical properties are extremely efficient. The refined lower root blend provides a stronger catalyst for the Storm of Misery, ensuring a more complete energy exchange.
The ritual spear is used to keep the storm active. After continuous improvement, the Ice Touched Witches can now use a spear to release a small storm and harvest the soul power that the Ice Touched Witches want.
The gray reliquary is an ancient and ominous stone tool that stores the charred corpses of members of the Gray Army. It is used in rituals to connect to the Gray King in the Gray Heaven, and to locate the coordinates of the plane of annihilation for the portal opened by the Storm of Sorrow.
"Tell me more about the lower roots." Wu Chen was very curious about this important alchemy material.
"Netherroot, also known as 'Netherroot', is said to be an unknown variant of Nirnroot. Early ice-touched covens used Netherroot Brew to summon a small - and hopefully harmless - storm of misery ." Dawn Warhammer Xili also has the answer.
"Where are the lower roots in the sky?" Wu Chen wanted to see this magical alchemical plant with his own eyes.
"Master, look." Dawn Warhammer Xili handed Wu Chen another ancient note.
"The Order Concerning the Lower Roots Below Castewiten": "Pentarch Sevida, the Witch of Reach, located another source of lower roots. It grew abundantly beneath Castewiten, and was grown by the natives. The locals completely ignore it and make no use of it. This root is different from the variety we find in the northern regions of Blackfall, but by adding the extra ingredients as I gave you before setting out, it will serve us well. Purpose. The lower roots will grow faster and help create more powerful Storms of Misery. Your task is to grow this new variety to feed the witches. Someone will check on your progress in a week. Signed: R (Rada)."
Karthwasten is a historic settlement named after its location on the banks of the Karls River. The settlement changed hands several times due to conflicts between the Reach and the Nords. The town has the ancient Sanuarach mine. The Nords want to mine the silver within, but the Reach consider this an affront to nature. By the Fourth Age, the conflict surrounding Castlevetten had subsided, and the town was owned by a Reacher but was inhabited by a diverse group of people.
By the middle of the Second Age, the conflict between the Reach and the Nords had reached a stalemate. Although the Nords control the territory north of Kastwitten, the town remains in Reach hands, led by the Crow-Eye Clan. In 2E 577, the then High King Svargrim decided to establish the new territory of Karthad, and its capital, Karthwatch, would become a forward bastion against the Reach people of Kastwetten.
In 2E 582, the Ice-Touched Witches began to hold the ritual of the Storm of Sorrow across Western Skyrim, stealing the souls of mortals to resurrect the Gray King. Both Kass Hope and Castlevetten were chosen as locations for the Storm of Sorrow. Kaas' Hope was completely destroyed, but Castelwetten was left mostly unscathed by the Crow-Eye Tribe's Defensive Wards.
But it is not without cost. The barrier has been greatly damaged. The tribal leader Shaman Ulvoch is too old and dim to repair the barrier by himself. Apprentice Fialyn recommends a worthy person. A trusted outsider comes to repair the barrier. Bring nature and things from the earth to the enchantment. Fallen willow branches represent the fragility of life, rocks bathed in moonlight represent purity, and cicada shells represent rebirth. The working principle of the barrier is to exchange with spirits to maintain peace between the earth and the spirit world. People will offer sacrifices and they will respond. The adventurers thought it was a magical ritual, but Ulverk said magic was just a word, uttered by cowards who feared it and fools who tried to master it. What he sees as magic is actually a connection to the land, nothing more.
After the adventurers collected and placed the sacrifices, Urwalker needed the adventurers to start negotiating with the spirits. Because the adventurers collected them with their own hands, he became part of Castelweiten, and Castelweiten also became part of him. But the ritual failed, and Ulwalk felt darkness and anger, as if something had disrupted the natural course of things. The adventurer inspected the ritual pyre and discovered the lower roots cultivated by the Gray Army. He and Fialin decided to go to the Sanulak Mine to remove the source of the lower roots. They burned the plants to drive out the vampires inside. The re-performed ritual was a success, and Urverk thanked the adventurers for their help. He will not rebuild Castelweiten because "the buildings here are echoes of people who do not belong here", he will not destroy the buildings, and he will not add to them.
During the period of the False King of the Third Age, Karthwasten was controlled by the Empire and was called Karthwasten Hall by them. The ruler is Duke Alarke.
At some point before Fourth Age 4E 201, the Stormcloaks were said to have committed a massacre at Castlevetten, and the Stormcloaks disputed responsibility for the conflict. At Hrothgar Peak, the Empire therefore demanded compensation as a condition of a temporary ceasefire.
At this time, Castelwetten was the last land in Skyrim owned by the Reach, as it was ruled by the Reach Ainethach. His family has owned the place for generations. The Nords naturally don't like him, and the local Reach people don't like him either, thinking that he betrays his race. At this time, Castelwetten was targeted by Markas' silver-blood family again, and the follow-up is unknown.
Meanwhile, the prophetess of Markarth dies, and the city's House of Dibella needs a new successor. The priests found the young girl Fjotra in Castelwetten, but she was taken to Broken Tower Redoubt by the Forsworn. The priests rescued Photela and brought her to the Temple of Dibella in Markarth to become the new Dibella Prophetess.
This is another memory copy that the Lord Lord poured in out of thin air.
Apparently, this was an adventure he had too.
However, just as he too had experienced Mosal's adventures. But whether it's Mosar's ice-touched witches or Castelwetten's nether roots, they are all hidden plots that he has not touched before.
Therefore, it is most likely related to "Tap Collapse Day".