The tainted vale of Moonrest.
Moonrest is a small wooded area in eastern Val'sharah, it contains Darkgrove Cavern. The Emerald Nightmare has tainted these woods. Lyrathos Darkgrove, a servant of Xavius has riddled this area with fel plants. Darkbinder Elissath can also be found here, attempting to resurrect night elven spirits and turn them into servants of the Burning Legion.
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Moonrest is probably named after the Moonfang family, whose ancestors are buried here.