Locations with maps: Ettenmoors
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The Angmarim within the city of Carn Dûm have a desire for the heartwood cut from the centre of the Leafcull-trees within the Grimwood. He has offered you a reward for collecting the heartwood.
Collect Grimwood-heartwood (20)
Grimwood-heartwood can be found on the Leafcull-trees, though you may possibly find it in the fallen logs as well.
Chieftain Torbok directed you to recover and return Grimwood-heartwood to him.