Knell of MuspilliCanonLegendsInfinities The Knell of Muspilli was first mentioned in the 2010 reference guide The Unknown Regions. Behind the scenes The Knell of Muspilli was first mentioned in the 2010 reference guide The Unknown Regions. Sources The Unknown RegionsBook of Sith: Secrets from the Dark SideAppearancesStar Wars: The Old Republic (Mentioned only) (Unknown)Unknown UnknownNone