1. CREATION BRIEF Generate an original 15-second dark-fantasy cinematic sequence in vertical 9:16 aspect ratio at 720p resolution. The video is a single sustained spectacle of a colossal ivory-white frost dragon assaulting a frozen mountain fortress carved into a glacial cliff. The dragon is the unambiguous protagonist of every frame: it dives from a blizzard-choked sky toward the icebound cit...
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