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Collect 8 and bring them to Tarindrella.
Something evil is brewing in the forests of Teldrassil. Look long the hills to where the peaceful furbolgs used to dwell. They have deserted their homes and are amassing under the name of the Gnarlpine tribe.
Engage these grells and grellkin, <name>, and see if they are indeed caught under the enchantment of the wicked Fel Moss.
Satisfy my suspicions, <name>. Bring to me 8 Fel Moss.
Your service to the creatures of Shadowglen is worthy of reward, <name>.
Travel west from Tarindrella [57.7, 45.2] to the camp of Grell and Grellkin located southwest of Aldrassil [56.0, 45.5]. Fel Moss will be randomly dropped by the mobs located here. Return to Tarindrella to complete the quest.