Create an exhilarating 8K image portraying Genghis Khan celebrating a triumphant victory alongside his loyal soldiers and jubilant citizens in the kingdom. Highlight hyperrealistic details in the expressions of joy, camaraderie, and gratitude among the participants. Showcase the festive atmosphere with intricate rendering of celebratory elements, such as banners, feasts, and cheering crowds. Utilize HDR techniques to enhance the vibrancy of colors and achieve a photorealistic quality. Implement Unreal Engine v5 for a seamless blend of 3D rendering and high-resolution professional photography, capturing the essence of a joyous and historic moment in Genghis Khan's reign

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