User blog comment:PsijicThief/Dark Brotherhood in Skyrim/@comment-6365350-20130909092125/@comment-7153552-20130909140541

Within TES there is what you call hard canon and soft canon (or what I call, anyway, lol). Hard canon is your main questlines, including those of expansions. The soft canon is a little more maliable and comes from faction quests and larger arching side-chains. Mostly I was just about fed up with reading from time to time about how the Dark Brotherhood is gone and certain wikians wouldn't be playing TES: VI because they needed the Brotherhood.