Online:Hounds of Hircine (quest)

Quick Walkthrough
# Find Tranya and talk to her.
# Go to the Dark Moon Refuge and talk to Onda.
# Search for Rasir's notes and follow the trail.
# Find the cave Rasir writes about.
 

Detailed Walkthrough
The quest can be started by finding Jolfr in the Dark Moon Grotto in Blackreach. He can be found southwest of the Dark Moon Grotto Wayshrine and southeast of the small cave on the in-game map. He will explain the Grotto contains a sanctuary for those who have fled the slavery of the Gray Host—including werewolves. However there has been an affliction running through the refugee werewolf population, causing them to become feral. An alchemist, Rasir was said to have been close to a cure but recently went missing. Jolfr suggests that if you want to help that you speak to Tranya, who in the lower caverns of the Dark Moon Grotto.

The small cavern contains the remaining uninfected werewolves and Tranya can be found trying to calm the others:
:Tranya: "Please, stay calm, everyone. We will find Alchemist Rasir."
:Irga: ''"What if he's already dead?"
:Jofra: "The affliction will catch up to us too. It's only a matter of time."''

Speaking with her, she will corroborate with what Jolfr said about the affliction and Rasir and that she worried about what happened to him. She also explains that her partner Skor went out looking for him but hasn't returned. After you agree to help search for the alchemist, Tranya will suggest that you visit their non-werewolf allies where they have barricaded themselves within the refuge. However, she believes that they will be reluctant to speak with her but feels that you have a better chance of getting information. 

When you arrive at the barricade of the Dark Moon Refuge, you will be forced to speak with Onda through the door. After warning you about the risk of hanging around Tranya, she explains that Rasir left the refuge to find a final ingredient for his potential cure but never returned. She suggests looking for a trail of clues as he apparently took his notes with him. Searching nearby you will soon come across a page from Rasir's journal, which can be collected and read. As you follow the trail, you will find more pages at some abandoned campfires which explain Rasir's recent activities. Rasir managed to obtain the final reagent for his cure—a Blackreach Morel—and went to find a viable test subject for the cure. The final page tells the reader where Rasnir went in the case that he did not survive.

With all the pages found you can explain what you read to Tranya. She notes that cave he writes about is nearby and suggests you investigate. The small cave is to the northeast of the Dark Moon Grotto refuge . When you arrive you will find an injured man that Tranya recognizes:
:Tranya: "Brigvar!"
Speaking with Brigvar, you will learn that he was one of the werewolves that went feral. He recalls an all-consuming rage that abated when Rasir administered his cure but while they were celebrating, they were suddenly attacked by Skor who appeared to have succumbed to the infliction. Rasir fled to the east while Skor chased after him. Heading in that direction you will soon come across a wounded but alive Rasir who has some important things to say. 

 
 

Notes
Killing Skor is not a quest objective and it's actually possible to sneak past him and rescue Rasir. You will be able to complete the quest as normal. However the other characters will refer to Skor as being "gone".
 

Quest Stages