Lonto Léok, a tradition from Manggarai, Indonesia, reflects a significant transformation in the context of unity and communal decisions. Originating from inter-tribal conflicts, this tradition has evolved into a symbol of family unity. In Lonto Léok, formal interaction mechanisms are led by a leader known as "Tu'a Golo," who serves as a facilitator and guides the deliberation process. There are three main stages in Lonto Léok: "caca" (unpack), "cica" (discuss), and "congko" (finalize), reflecting an intensive deliberation process to reach collective agreements. This research aims to elucidate the history, meaning, and mechanisms of Lonto Leok in Manggarai culture while highlighting issues that still need to be addressed. The author adopts a qualitative method based on literature review, interviews, and the author's direct experiences as data sources. The research findings reveal that the shift in the meaning of Lonto Léok from battle to family unity demonstrates cultural adaptability in the face of social change. Lonto Léok represents how the Manggarai community manages conflicts and achieves consensus through deliberation and agreement.