The Elder Scrolls IV: Oblivion Tips

Dark BrotherHood
There is another way to join the Dark Brotherhood all you have to do is go into the arena and accept the Grey Prince's quest. Finish the quest, come back, get the training from him plus you also get an easy kill when you have to fight him in the arena to become grand champion... so just to recap you get the Grey Prince's training, easy grandchampion title and entrance into the Dark Brotherhood without having to kill any innocents.