Instructions
Getting the Quest for the Cure
Talk to Raminus Polus at the Arcane University and ask about a cure. He will direct you to Count Janus Hassildor at Castle Skingrad.
Talk to Hal-Liurz and he will allow you to talk to the Count.
Talk to Count Janus Hassildor and accept his quest to find a cure.
Follow the location that Count Hassildor marked on your map to find the witch Melisande. Talk to her about the cure, and she will give you a quest.
Collecting Ingredients
Go to Mages Guilds around the world and purchase five Grand Soul Gems; return them to the witch.
Gather six cloves of garlic from homes in Skingrad.
Find and pick five nightshade leaves Southeast of Skingrad.
Pick two shoots of blood grass from around an Oblivion Gate.
Complete the Witch's Quest
Hit one Argonian with the special dagger given to you by the witch. You do not have to kill them.
Kill the vampire Hindaril and take his ashes to the witch. You'll find his location on your map.
Drink the potion she gives you.