An undead spirit raised by the will of nature to deal with things that are deemed a threat to the balance of life in the region.
We have met two Duraghs:
One unnamed in New Dothulgrad, who was working with the Eldremar Rebellion to acquire the Valuren Warship.
Archdruid Vargoth working to defy Toth from underneath Twinslove. It is unclear if he was truly a Duragh, or someone simply claiming to be one.