Dark Break is a stage-exclusive attack belonging to Black Lady, seen only in the Sailor Moon musicals. Its single appearance comes in the production centered on her rise as the princess of darkness.
The technique never crossed into the anime, manga, or games; it lives entirely on the theatrical stage. Black Lady is its only practitioner within the musical continuity that fans call Sera Myu.
Details on how the strike works are scarce, since the source records little more than its name and where it first appeared. It stands as one of the villainous abilities showcased during her live performances.

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Dark Break is a stage-exclusive attack belonging to Black Lady, seen only in the Sailor Moon musicals known as Sera Myu.
Only the musical version of Black Lady uses Dark Break within the Sera Myu continuity.
No, Dark Break never crossed into the anime, manga, or games; it exists entirely on the theatrical stage.
Dark Break first appears in the Sera Myu production centered on Black Lady's rise as the princess of darkness, titled Pretty Soldier Sailor Moon ~ The Birth! The Princess of Darkness, Black Lady.
Very little detail survives about Dark Break's mechanics beyond its name and where it first appeared, marking it as one of Black Lady's villainous abilities on stage.
Looking for more on Dark Break? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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