For the Oblivion quest, see The Purification.

Purification is a term often associated with the fall of a Sanctuary. Many members of the Dark Brotherhood believe that when this happens it is due to the will of Sithis and the Night Mother deeming their children there have grown weak. Usually, a member of the Black Hand is required to have the members of the Sanctuary in question murdered so that it can be cleansed of weakness.