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Zethresh is a naga Warlord.

Rumors abound that a large naga force, under a warlord called Zethresh, hides near Crestfall's west shore. Zethresh reputedly seeks to cleanse the ocean and her isles of human encroachment.^{LoC 101}

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Crestfall isle has a community of fishers and boats, but aren't very amicable. The attacks of naga have incremented in the zone. A warlord Naga known as Zethresh hides within the western coast of Crestfall. South of Gilneas, Zul'Dare has been occupied by naga.