Dark fantasy, blood demon, mysterious ancient tome, ornate iron chains, crimson eyes glowing with malevolent intent, dark red skin, horns curved like scimitars, black bat wings spread wide, eerie mist swirling around, dimly lit dungeon chamber, stone pedestal, ritualistic circle of candles, forbidden knowledge etched on parchment, sinister smile, bloodstained fangs, intricate demonic script, hellish flames dancing in the background, ominous shadows cast on walls.