The Master-at-Arms is charged with maintaining the Dark Jedi Roll, and ensuring its accuracy. New Apprentices are processed by the Master-at-Arms, as well as Novices assigned to Clans. The Master-at-Arms is responsible for approving all rank promotions and position appointments within the Dark Brotherhood (apart from Dark Council roles), as well as transfers of members between Houses and Clans, and as such can deny these requests if he deems them unworthy or unacceptable. The Master-at-Arms furthermore has been charged with the task of ensuring that feuding Clans follow the rules of the Art of Vendetta.
The Master-At-Arms has also been tasked with the jobs of the former Chancellor. He is now also in charge of approving medal requests.