Morrowind:Corprus Cure

Quick Walkthrough
# Return to Caius in Balmora and talk with him to learn of a possible Corprus cure.
# Travel to Tel Fyr, give Divayth Fyr the artifact, and talk with him.
# Retrieve the Dwemer Boots of Flying from Yagrum Bagarn deep within the Corprusarium.
# Receive the cure from Divayth.

Detailed Walkthrough
Finding Divayth Fyr
During the last quest to destroy the Sixth House base near Gnaar Mok, you contracted the apparently incurable Corprus Disease. While you have Corprus, the disposition of anyone you talk to will drop significantly, so it's a good idea to return to Caius as soon as possible. Back in Balmora, Caius is shocked to hear of your condition, but believes there may be a cure. Apparently, Fast Eddie, a local Telvanni expert, says that a Telvanni Wizard, Divayth Fyr, runs a Corprusarium deep beneath his tower in Tel Fyr, dedicated to the study of Corprus disease, and may be able to help you. Apparently, Fyr is a collector of Dwemer artifacts, and Caius provides you with a Dwemer Coherer to help raise Divayth's disposition. You will also receive some gold to pay for the cure, and a few levitation potions for use in the tower. The artifact weighs 40 pounds, so be sure you're able to carry that much.

Tel Fyr is on an island in the eastern archipelago of Vvardenfell, in the Azura's Coast Region. You can get it marked by a scout in the Fighters Guild in Sadrith Mora, if you have not already learned of its location. The fastest way would be to take a Guild Guide over to Sadrith Mora or, alternatively, you can take a boat to Sadrith Mora from Ebonheart.

Meet with Divayth Fyr
Once inside Tel Fyr, Onyx Hall, you should talk to Beyte Fyr, a Dark Elf woman, across from the entrance to find out that Divayth is in his study, accessible by the main fly well. The fly well is upstairs in the Hall of Fyr, inside and to the right of the entrance. If you need more Levitation or Invisibility potions, you can steal them from a shelf in the bedroom on the main floor of the Hall of Fyr. Levitate up and find Divayth, dressed in Daedric armor and standing in front of a purple crystal. Give him the Dwemer artifact and ask him about the corprus disease. You may have to additionally raise his Disposition by persuasion in order to get him to talk to you. Divayth has plenty to say about the disease, but mention that you may fulfill the Nerevarine Prophecies and he will quickly offer you an experimental and possibly fatal cure for Corprus. However, before he agrees to give you the cure, he will ask you to fetch a pair of enchanted boots from Yagrum Bagarn below in the Corprusarium and return them to Fyr. On the face of it, this is a menial chore, but Fyr's real intention is for you to see the place in which you will spend the rest of your life if the cure doesn't work.

If you have angered Divayth previously by killing some of the members of the Corprusarium, you may be able to persuade him to assist you, either with conversation, or magic, but if you have killed the warden, he and his daughters will attack you when you talk to them. Sometimes Divayth is extremely mad about what you have done, and presents you with no conversation options except "Goodbye". You can fix this by entering  .

The Corprusarium
|thumb|right|Yagrum Bagarn

The Corprusarium is downstairs, through the Onyx Hall. Before you enter, you will encounter the warden Vistha-Kai who will tell you not to harm the inmates, though they certainly have no qualms about hurting you. This is a good place for Invisibility or Chameleon if you have it, or a good Sneak skill. Fortunately, once you enter the Corprusarium Bowels, one of the inmates you encounter will not be hostile towards you. Yagrum is in the central cave, and is hard to miss. He will give you the Dwemer Boots of Flying and has some interesting comments on the disappearance of the Dwemer.

There is also a trick in getting the more usual Corprus victims not to attack you. Find the guarskin drum and give it to Uupse Fyr next to Yagrum, and she will play a rhythm to soothe the inmates. Any guarskin drum will do, but unless you have brought one with you the nearest one is in the Corprusarium.  If you have Drain Fatigue or Damage Fatigue magic, you can use that (or Hand-to-hand skill) to knock out the Corprus Stalkers and Lame Corpruses in the area, without triggering any alarm on the part of the NPCs like the Fyrs and Vistha-Kai (even if you injure the Corprus creatures a bit while knocked out, as long as you kill none of them and hit them with no weapons or damaging spells).

The Cure?
Return to Divayth, give him the boots, and accept the potion.

It turns out that the potion doesn't actually cure you, but just removes the negative effects of the disease. Therefore, you have the complete disease resistance that Corprus gives, but no loss of attributes. Note that the 1000 gold Caius gave you wasn't needed, meaning you're a bit richer too. You can return to Caius in Balmora for the next stage of the quest.

If you return to Fyr at a later point in the game, he will tell you that the potion doesn't seem to work on the rest of his cases and that he killed two of his most desperate patients while testing it. Apparently you are an exceptional case, though as you may have found out, the Nerevarine is supposedly protected from this death by prophecy.

Notes
Fyr has some additional dialogue regarding Corprus Disease, consisting of him telling you that your case is hopeless and you should prepare to be interred in the Corprusarium. The trigger for this dialogue is contracting Corprus before being cursed with it by Dagoth Gares. There is in fact another way to get Corprus besides the scripted event which occurs when Dagoth Gares dies. Tanusea Veloth in the Arena Pit of Vivec has Corprus Disease, which you can contract by searching her corpse. It is a differently scripted version of the Corprus effect, and it will prevent you from completing the Main Quest since Divayth Fyr will be unable to cure you.
During the dialogue with Divayth Fyr when you take the potion, a script runs which gives you 100% Resistance to Common Disease, Blight Disease and Corprus Disease, and removes the other Corprus effects. However, after you end conversation with Fyr, he will cast an entirely superfluous spell of Cure Blight Disease on you.
Completing this quest makes it more difficult to become a Vampire, because vampirism requires that you contract Porphyric Hemophilia, a common disease. Casting Weakness to Common Disease on yourself can help mitigate this issue.

Bugs
 
 
 
Solve this by dropping all but one of the copies on floor and talk to him again.
 
 

Quest Stages