Ancient, mysterious Eldritch altar, twisted, cyclopean structure, eerie green glow, pulsing runes, otherworldly symbols etched into stone, creepy tentacles wrapping around pillars, dimly lit, misty atmosphere, abandoned temple, jungle overgrowth, vines crawling up walls, moss-covered stones, ancient artifacts scattered nearby, mysterious relics, forbidden knowledge, dark rituals, sinister ambiance, ominous shadows, dramatic lighting, cinematic composition.