What role do the Farsight Enclave and the Eight play in the greater narrative of the Warhammer 40,000 universe?

The Farsight Enclave and the Eight are factions within the Tau Empire in the Warhammer 40,000 universe. Led by Commander Farsight, they have broken away from the main Tau Empire and operate independently. The Farsight Enclave and the Eight play a significant role in the narrative by challenging the traditional beliefs of the Tau Empire and exploring different paths for their society. They also provide a unique perspective on the conflicts and alliances within the Warhammer 40,000 universe.