Demonic demon with glowing eyes and glowing fangs in a dark room

(best quality,4k,8k,highres,masterpiece:1.2),ultra-detailed,(realistic,photorealistic,photo-realistic:1.37),cosmic horror,terrifying gargantuan demon summoned from a magic square,deformed head with twisted horns,incredible number of enormous fangs,sharp and elongated claws,long tail,dreadful figure enveloped in blue flames,dark and eerie atmosphere,intense otherworldly presence,flickering ethereal glow,mythical and menacing aura,tentacles writhing and coiling ominously,ominous shadows looming in the background,powerful and malignant entity emerging from a portal of darkness,sinister and surreal alternate dimension,overwhelming sense of dread and fear,unsettling and disturbing composition,extremely detailed and intricate artwork,nightmarish and grotesque appearance,eerie and piercing gaze,ominous and predatory posture,outlandish and contorted anatomy,demonic energy pulsating from every fiber,ominous whispers echoing in the air,hypnotic and disorienting visual effects,dark and foreboding color palette,dynamic and dramatic lighting effects,ominous and mysterious ambience,ethereal and haunting presence,evoking deep-seated unease and terror,fantastical and monstrous abomination.