Ravana Prabhu is a powerful action thriller that serves as a legacy sequel to the classic film Devasuram. The story revolves around the fiery Mangalassery Karthikeyan, who builds a business empire as a liquor baron, much to the disapproval of his principled father, Neelakandan. The familial tension is eclipsed when an old enemy, Mundakkal Shekharan, re-emerges, carrying a deep-seated vengeance against Neelakandan. Shekharan strikes at the family's heart by orchestrating the loss of their ancestral home, a place sacred to Karthikeyan, as it holds the ashes of his mother. The film escalates into a dramatic saga of love, honour, and vengeance, asking whether love can end a cycle of hatred that has spanned generations.