In Sri Lankan mythology, the demon king known for his powers and ties to the underworld is Ravana. He is often depicted as a complex antagonist in the epic Ramayana, where he abducts Sita, the wife of the hero Rama. Ravana is associated with wisdom and devotion to Shiva, showcasing a blend of villainy and respect. His character embodies themes of power, ambition, and the struggle between good and evil in Sri Lankan narrative traditions.