Wikipedia: Kira's zanpakutō is Wabisuke (侘助?, roughly "The Apologizer", translated in the English
manga as "the penitent one"). The shikai command is "raise your head". When released, Wabisuke takes the form of a sword with a square hook that has the ability to double the weight of whatever it strikes. The effect is cumulative, so each following hit exponentially increases the weight of the target. Thus, after seven or eight blocked attacks, his opponents are unable to lift their own swords or even move their body, leaving them on the ground with their head bowed as though asking forgiveness. At this point Wabisuke's released form, a blade bent into a squared hook, comes into play, being used to decapitate the kneeling opponent, denying them forgiveness.
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