The Mossfoot Gnolls are at the heart of it all. I have done my best to restore the balance in the Shrills, but finding a solution to the Gnoll problem may require something more subtle. I have constructed a Scaregnoll near Darnog Thran but it's effectiveness seems to have dwindled. Find a Harrow Bear head, some wool cloth, and a few sprigs of Gnollsbane. The sprogs in Overlook Grove wear the Gnollsbane around their necks. I am sure you can manage a few sprogs. Take these items and repair the Scaregnoll near the Darnog Thran. That should keep them at bay a little while longer!