Epic dark Vietnamese historical poster thumbnail, 9:16 vertical 1080x1920. Subject: Lý Thường Kiệt, legendary Đại Việt commander of the Lý dynasty, heroic portrait in 11th century Vietnamese armor, Như Nguyệt river defense line below, smoky battlefield and Song army silhouettes, storm clouds, sepia bronze gold palette, parchment texture, black ink splash / grunge title panel, large gold Vietnamese brush-calligraphy title text: "LÝ THƯỜNG KIỆT". Subtitle small: "VỊ TƯỚNG KHIẾN NHÀ TỐNG KHIẾP SỢ". Dramatic contrast, cinematic, culturally grounded Vietnamese Lý dynasty costume, no modern objects, no watermark, no logo.