You sleep rather soundly for a cold-blooded killer. That's good. You'll need a clear conscience for what I'd like to propose. For there is much I can offer you. The taking of a life has its own pleasures, of course, but the taking of a life for the Dark Brotherhood is an act worthy of immeasurable reward.
If you're intrigued, and I suspect you are, come visit me at the ruins of Fort Farragut. If you survive the descent down to the bottom level where I reside, I'll know you're capable of all the Dark Brotherhood has to offer.