Origins

This was the best part of Oblivion for me. Not the DB questline itself, just this epic, raging revenge story. The Brotherhood killed his mom, so he entered it and made it surgically dismantle itself with its own tools of destruction. He got revenge twenty-fold against the assassins, and at the end of the story I just couldn't help but smile at how he not only got the most epic revenge of all time, but how he proved in the process that he was more worthy an assassin than any other. I can't imagine Sithis wouldn't be proud of him for the sheer darkness of his heart and remorseless blood thirst he exhibited in coldly dispatching an entire army of trained killers.