Online:A Favor Returned

Quick Walkthrough
#Talk to Ordinator who tells you to go register with Registrar Riivel at the City Center.
#Talk to Naryu Virian outside the Tribunal Temple.
#Talk to Almalexia.
#Talk to Naryu Virian in the Flaming Nix.
#Steal the key from the courier.
#Investigate the House Dres Farmstead.
#Talk to Naryu Virian.

Detailed Walkthrough
Talk to any of the Ordinators in Mournhold. They will tell you to speak with Registrar Riivel in front of the City Center. Everyone who enters the city must be registered, and you're no exception. When you speak to the Registrar, you're told that Almalexia herself has given the order to register you as a citizen, and that she wants to see you in the Temple. Make your way to the Tribunal Temple. As you climb the stairs, you'll notice Naryu Virian standing outside, leaning against  wall. You should Speak with her.

Naryu says that the Maulborn are in Mournhold. Since you have a date with Almalexia, she wants you to tell the goddess about the Maulborn. After all, this is important, and Almalexia cares about the city anyways. While you're attending your meeting, Naryu is going to learn more about the Maulborn. She 's going to try to find out where they're hiding. Almalexia commends you for your efforts against the Maulborn, and allows you to come and go as you please. She also grants you the authority to investigate the Maulborn's presence in Mournhold. Once you're done talking to Almalexia, you should meet Naryu in the Flaming Nix, the cornerclub south of the temple.

Naryu Virian is leaning against the wall in the cornerclub. She saw the House Dres farm outside the city was on high alert. They are using a courier named Thauravil to deliver bribes to the other house leaders and city officials. She suggests taking the courier's key to get into the farm house. The courier, Thauravil Dres, picks up bottles of wine at the cornerclub. She wants you to slip a sleeping poison into the wine, follow him and take the key when he falls asleep. Alternatively, you can persuade Naryu to distract him so you can take the key off of the courier's unconscious body.
 
The   is in the lower level of the Flaming Nix on some crates. After the wine is poisoned, return to Naryu. The courier runs out of the cornerclub. If he detects you when you are following him, speak to Naryu again, and the courier will come back for more wine.
 
The courier falls asleep behind the stables west of the Fighters Guild. His nap spot is close to the House Dres Farm map marker, and there are some guar in and around the stables. Take the   off of his limp body and go to the House Dres Farmstead. Sathram House in particular is where you're going to want to go, as it's unlocked by the key you just stole.

Inside Sathram House there is a host of suspicious things. The rug in the back is where you're going to want to look, but there are many other things inside the house that you can examine.

Investigate the Suspicious Urn.
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There are some Suspicious Gems on a dresser. You should give those a look, too.
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A Suspicious Philter sits on a nightstand.
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Suspicious Ash sits in the firepit in the middle of the room. 
:The distinctive reek of charred flesh permeates the room, rising from this pile of damp cinders. Whatever creature was burned here has been entirely reduced to ash.>

There is also a Suspicious Turkey Leg on a sofa located against the wall. Diabolical!
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The Suspicious Rug is what you really want to investigate. Moving it reveals a trapdoor that leads to the Mournhold Underground. Naryu Virian enters the house after you discover the door. Speak with her to complete the quest.
  

Quest Stages