The episode is titled (or Genkai no Saki ). Here is the story of that pivotal moment: The Battle at the Underwater Temple

The filename you provided refers to of the anime Black Clover (the "H11" likely being an internal group code, and "ArDub" meaning Arabic Dub).

The Black Bulls are trapped in a desperate struggle against , a high-ranking member of the Eye of the Midnight Sun. Vetto’s overwhelming "Beast Magic" has already broken the spirits and bodies of most of the squad. Pushing Past the Brink

Asta manages to close the distance. With a massive overhead swing of his , he strikes Vetto down. This victory marks the first time the Black Bulls truly worked together as a cohesive unit to defeat a "Third Eye" level threat. However, the victory is bittersweet, as Asta’s arms remain severely injured, leading into the next major arc of the series.