The phrase kuraei has long been used in Japanese anime, manga and games as a battle cry shouted while attacking, similar to other short Japanese voice clips like ara ara that circulate on soundboards. It is not tied to one confirmed character or title in this clip, so its appeal is the generic, instantly readable intent. Online, creators lift the shout out of context and reuse it for fights, throws, spells and comedic hits, where the language barrier matters less than the aggressive delivery and timing.