A fearsome demon clad in intricately designed armor, his form cloaked in flowing robes of obsidian and crimson hues, exuding an aura of dark magic. His visage is a swirling, incandescent orb of fiery energy, casting an eerie glow that dances upon nearby surfaces, blending seamlessly into the high fantasy realms akin to those of Lord of the Rings and Dungeons and Dragons. Chains, etched with ancient runes, coil around his imposing frame, resonating with power. The demon stands amidst a landscape of mystic shadows and arcane sigils, his presence a living embodiment of otherworldly menace and supernatural might. Rendered in striking 4k ultra realism, utilizing the visual prowess of Unreal Engine, every detail from the ornamental armor to the animated energy of his head is brought to vivid life.