According to Velinde's Journal, the Lords of the Emerald Flame are an incredibly powerful enemy of the worgen. They do battle with the worgen on their native homeworld, and Velinde Starsong got to know of this ferocious war through her use of the Scythe of Elune. Apparently, the struggle against the Lords of the Emerald Flame does not go too well, as the worgen found their enemy to be an unflinching one indeed.
- "Holding the Scythe in my hands, I received a vision of chaos. Wolf-men... the worgen... battled an incredible enemy. The worgen fought savagely, as fit their primitive race, but their enemy was unflinching: the Lords of the Emerald Flame."
It could also refer to a force of the green dragonflight defending the Emerald Dream from the Emerald Nightmare. This way, the worgen could just be part of the Emerald Nightmare (thus being fought by the "Emerald Flame"). Judging by the true origins of the Worgen, the theory that the 'Lords of the Emerald Flame' are in fact the Green Dragonflight seems to be most likely.