The Soul of the Demon Prince is a glowing, ethereal orb with a dark, swirling core that pulses with a faint, ominous light. The exterior is smooth yet appears to be in constant, subtle motion, as if alive, with tendrils of energy occasionally licking outward like flames. The color palette is a deep, rich purple with hints of black and crimson, suggesting its demonic origin. The soul emits a soft, eerie glow that illuminates its immediate surroundings, casting shifting shadows.