Travel through Timbermaw Hold and exit into Winterspring. Speak with Salfa, who stands guard outside the entrance to Timbermaw Hold.
The threat of corruption comes not only from the Deadwood furbolgs to the south, but also from the east and the Winterfall furbolgs of Winterspring. If you wish to further aid us, speak with Salfa on the other side of the Hold, by the Winterspring entrance. Follow the path to the left to reach it.
Be warned - if my kind inside considers you hostile or hated, they will attack. Travel as quick as you can, avoiding conflict. To kill a Timbermaw - even in self defense - will only alienate you further.