The Shadow in the Dark.
A little bit of info on who's who and what's what.
Circle of Nine: A group of nine of the most powerful liches from all over Tamriel, lead by the most powerful. They seek the destruction of the living, and to rule over all of Nirn with an undead Empire.
They often recruit the living to do their dirty work for them, cultists and Daedra worshipers, fighting to bring about the ruin of the world.
The Shadow Fang Coven: A powerful coven of vampires, living in the restored Bloodlet Throne, lead by Salthar Vivarian. Although they too are undead, rather than trying to destroy the world of the living, the wish to influence it through deceit, murder, and subterfuge. Considering mortals beneath them, the forces of the coven are entirely undead. Over the decades, the covens' influence has spread from Skyrim to the Somerset Isles. Interestingly enough, very few of these vampires have ties to Molag Bal.
The Rangers Guild: A group of warriors, trained in the woodland arts, all of which have an almost unnatural affinity with nature and beasts. They have taken a solemn oath to defend the forests and fields of Tamriel. Although mostly stationed in Skyrim, rangers have been known to travel to High Rock and Hammerfell on occasion.
The Soul Reaver: A sword forged in the First Era, this blade has been hidden well under the surface of Tamriel, this blade is capable of ripping the soul from any enemy it encounters, and once the blade has filled it's quota of souls, it releases a powerful arcane explosion, obliterating the wielders enemies in seconds.
Morghul: A devoted follower of Molag Bal, Morghul has devoted his entire life to finding the Soul Reaver. Now that he has achieved permission and a small army from the Circle of Nine, his 'masters' the champion of Bal leads his army in a search for the fabled blade, eager to end all life on Nirn.
Navir Fellheart: A Dunmer vampire, Navir both mistrusts and dislikes Salthar Vivarian and his motives. Under orders to get the Soul Reaver and return it to the Bloodlet Throne, Navir sets out with a host of Undead at his command. However, the scheming Dark elf may have other ideas for the outcome of the mission.
Aldran Goldblade: The great-great grandson of Arthonir Goldblade, Aldran has heard disturbing reports of Undead forces massing near Falkreath. Fearing for the innocent people of that often attacked and terrorized town, he and his comrades head to Falkreath to support the local guards.
This story is set in Skyrim, in the 301st year of the Fourth Era. Much in Skyrim has changed, new settlements and cities set up and new Jarls named. Bear with me if you see the name of an unfamiliar city or town.