The Dark Brotherhood Forever

Background
''I am now the Listener and leader of the Dark Brotherhood in Skyrim. It is my duty to hear the words of our unholy matron, the Night Mother, and do as she commands.''


 * This quest is a Radiant Story quest and repeats infinitely.

Walkthrough
This seems to be a repeatable quest type just to provide steady income/content for the player; even more so than the simple Contracts outlined earlier. The people are often nameless and are spawned for the quest, and it is quite possible for the quests to repeat.

The mission repeats itself with the three objectives: Approach the Night Mother's coffin, speak with the contact (example: “blasphemous priest” or “rebellious guard”) and then kill the target (example, “ravaged mage”). Your contact will pay you, according to your level, the first time you talk to him/her, before you even kill your target. After you have eliminated your target, return directly to the Night Mother to start another similar quest.

Trivia

 * There is an exploit to get double the gold from a client, walk up to them and let them talk, when they start talk hit A, X or E, you will get the gold they were going to pay you, then they will repeat what they were going to say, let them finish and you will get the same amount of gold given you when you pressed the talk button. (This does not work every time in the patched version)
 * For some reason if you kill the Grim Shieldmaiden in Markarth or the Traveling Dignitary in Solitude, the city guards will attack you despite you being hidden and them being far away. (This sometimes happens in the patched version). A workaround for this is to pickpocket the target and get caught, causing them to attack you (make sure you're far away from any guards when you do this). You're then free to kill the target or allow the guards to do it for you; you'll get credit either way.
 * A way to easily kill your target is to use unrelenting force, provided you have a follower is to use the unrelenting force on your target and your target will now become hostile towards you. Do not attack your target, simply leave it to your follower as he/she we will attack the target and your target will fall to it's death. In some instances, a target may die if your shout is powerful enough, this way it is not necessary to have a follower. Though a guard nearby may ask you to stop.