Oblivion:Mephala

Quick Walkthrough
#Once you have reached level 15, travel to the Shrine of Mephala, and make an offering of nightshade.
# Activate the shrine with the offering between midnight and dawn to receive your task.
# Kill the leaders of two prominent families in Bleaker's Way.
# Plant evidence suggesting the deaths were the product of house warring.
# Return to the shrine for your reward of the Ebony Blade.

Detailed Walkthrough
Locating the Shrine of Mephala
Mephala's Shrine is located in the Great Forest, east of the Silver Road, halfway between where it meets the Orange and Red Ring Roads.

The location of this Shrine can be marked on your map by:
Speaking to Ontus Vanin about "Daedric shrines"; you must have already read Modern Heretics or have spoken with Ulene Hlervu about "Cheydinhal".
Speaking to Luther Broad about "Imperial City"; you must raise disposition to 60.

An Offering to the God
You need to be at least level 15 to start this quest. Talk to the Dunmer there, Dredena Hlavel. Request an audience and she will tell you to make an offering of nightshade between midnight and dawn; places where it can be found are detailed on the Nightshade article. Once you have some nightshade activate the shrine. Mephala wants you to go to Bleaker's Way and kill the leaders of the two prominent families there. Her exact dialogue is:
:''Call me 'Webspinner'. Pluck but a single thread, and the weave unravels. In Bleaker's Way, two families, Nord and Dunmer, live in perfect harmony. But beneath the surface lurks the secret seed of strife. Kill the leaders of the two families. Plant evidence to implicate the other family as the killer. And don't get caught. Be cunning. Don't spoil my scheme. And don't die... that would spoil everything. Ha-ha-ha-hah!''

The leaders are Hrol Ulfgar and Nivan Dalvilu.  After killing them you are supposed to plant evidence making it look like the other family was responsible for the murder.
thumb|right|Dalvilu vs Ulfgar - the fight begins

The Task at Hand
When you first get to Bleaker's Way, you need to find the fake evidence.  Inside Nivan Dalvilu's house you will find a Dalvilu Cermonial Dagger , located on a low table to the right of the entrance; this dagger should be planted on Hrol Ulfgar's body after you've killed him.  In Hrol Ulfgar's house you will find the Ulfgar Family Ring, located next to a Guide to Leyawiin on a table near the base of the attic stairs; the ring should be planted on Nivan Dalvilu's body also after you've killed him. Wait in their houses until they come home, and kill them. Plant the evidence listed above. Before returning to Mephala's shrine, talk to any of the Dalvilu or Ulfgar family members about Hrol Ulfgar or Nivan Dalvilu to plant the seeds of animosity.  Once that is done, the families will openly attack each other until one of the families has been destroyed.

Return to the shrine to receive the Ebony Blade, a one-handed blade with Silence and Absorb Health enchantments. Mephala will congratulate you:
:''Well done, little webspinner. Is there a prettier sight than friends at war? Take pleasure in the strife you have caused, mortal. Savor the divine essence of a well-spun plot. And here's a little needle to help you stitch your own tangled tapestries.''

Notes
This is one of the few quests that requires you to murder. For players wanting to avoid the stat increment for this there are several options:
The aggression of the clan leaders is 20, meaning that they will attack you with a disposition lower than 15. Simply use the persuasion mini-game to accomplish this - they will then attack you first.
Creatures from the wilderness may kill the leaders for you.
Given that you are not caught, reverse pickpocketing a Poisoned Apple into the leaders.
If you've obtained the Sanguine Rose reward from Sanguine, you can use its power to summon Daedra to kill both men on your behalf.
If you have completed the Vaermina quest, you can use the Skull of Corruption on your victims. The copies created will commit the murders for you.
There are several ways to fail this quest:
If you are caught committing a crime in Bleaker's Way (e.g., if you are caught breaking into one of the family's houses) before starting this quest, you will not even be allowed to start the quest.
If everybody in Bleaker's Way dies.
It is impossible to keep the Dalvilu Cermonial Dagger  or the Ulfgar Family Ring if you complete the quest. Once the items are placed in the dead bodies, they are removed from the game via script.
 If you use the console to resurrect one of the members of the defeated family, the family that survived will all die.
If you want to invest in every store in Cyrodiil you should ensure that you have already invested with the Bleaker's Way innkeeper, Kirsten Ulfgar, or that the quest succeeds. Even if she survives the battle you will be unable to trade or invest with her if you fail the quest.

Bugs
 
   This bug can be very useful to console players who have no access to the command console and have been disqualified from Hermaeus Mora's quest by failing Malacath's or Namira's quests. When the erroneous quest update happens, the counter used to track completed Daedric shrine quests is incremented for a second time, and this will make up for a missing quest. However, the counter must be exactly 14 to trigger Hermaeus Mora's quest, so completing this quest twice in addition to the other 13 daedric quests will prevent it from starting.
 
 

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