The Dark Brotherhood is simply a side-quest in the game.
It isn't crucial to the storyline but being in the Dark Brotherhood allows you to get weapons/spells/etc. that are normally unattainable.
No!
its not a cheat code, you get it when joining the dark brotherhood
If your a high enough level (somewhere around 20) you can get them from either the dark brotherhood or off of a creature in oblivion.
You can only get the Languorwine Blade during the Dark Brotherhood quest, The Assassinated Man.
He's talking about the task he gave the player character in Oblivion, to kill all the members of the Cheydinhal Sanctuary. This quest was called 'The Purification'. When LaChance was a member of the Dark Brotherhood, 200 years previously, it had a code of honour that was usually strictly adhered to. He clearly does not approve of the ways of the current Dark Brotherhood.
if you mean the dark brotherhood armor kill someone then sleep until you get invited into the family
It is already enchanted so you can't do anything to it.
If you are a member of the dark brotherhood you can talk to one of the members there about it once you have completed all of his missions.
The only accessable Dark Brotherhood sanctuary in the game is the one in Cheydinhal and the Black Hand does not meet in any specific place.
Hell no Assassin's Creed Brotherhood is way better
The Dark Brotherhood Sanctuary is located in the Cheydinhal East Gate.
find vampires and let them attack you until it says you have contracted what ever the diesese is called then sleep or do lots of dark brotherhood quests and a vampire will offer to turn you into a vampire.