Dark Brotherhood
Overview
The assassin's guild, this is the organisation for those interested in murder for fun and profit.
Joining
You don't find the Dark Brotherhood, the Dark Brotherhood finds you. If you commit a murder without witnesses, the Dark Brotherhood will come calling. Note that the victim must be innocent and killed in cold blood – not someone who has first attacked you. When you have killed someone appropriate you will receive the message “Your killing has been observed by forces unknown”.
After committing your foul deed, you must sleep in a secure location, preferably outdoors (any bandit camp will do, as will any tents outside forts or Ayleid Ruins). Lucien Lachance will interrupt your sleep and task you with another murder, as well as give you a Blade of Woe (a pretty unremarkable blade, outside of its unique design). Accomplish this, and you will be a member of the Dark Brotherhood.
Quests
1 – A Knife in the Dark