Unicornio demoníaco ante un castillo gótico bajo cielo tormentoso

A low-angle portrait of a dark, foreboding scene with a menacing being resembling a unicorn or a demonic entity. The being has vivid ocean-blue eyes, sharp teeth, and a glowing horn. Its mane is long and flowing, with a dark, almost black color. The background features a gothic-style castle with tall spires and red-lit windows, set against a dramatic, purple-hued sky filled with lightning. The overall atmosphere is dark and ominous, with a sense of impending danger.