Zabaniya belongs to Hassan-i-Sabbah, the Assassin-class servant in the Fate series, and is best known from Fate/stay night: Heaven's Feel, the darker route where the Holy Grail War turns more brutal and secretive. As a Noble Phantasm, it represents the legendary techniques attributed to the historical Order of Assassins, reimagined as a supernatural ability. Clips of the name and its activation have circulated through anime edits, reaction videos and fan soundboards, keeping it popular with Fate fans who use it to signal stealth, assassination and an unavoidable strike.