In both Oblivion and Skyrim I have enjoyed the Dark Brotherhood. I never understood though why did the Dark Brotherhood almost become extinct in the 4th era? I know Bravil was sacked by the Thalmor and Cicero was forced to move the Night Mother. But surely they have other chapters elsewhere in the empire? Or are they just native to Cyrodil? I know they broke off from the Morag Tong after some differences of opinions. Also what happened to the Black Hand the DB's ruling council? And was the COC the last listener before the Dovahkiin?

I know why Astrid gave up on some of their traditions like the Five Tenants, in fact it looked like Astrid wanted to re-organize the db into a professional group of assassin's, unlike the crazy cultists in Oblivion.