Briarback Quills

Hobbs in Stormsong Valley will trade these for various items.

Source
This item drops from the following quilboar in Stormsong Valley:
 * Briarback Boarmaster
 * Briarback Geomancer
 * Briarback Kraultender
 * Briarback Lookout
 * Briarback Packmaster
 * Briarback Skirmisher
 * Briarback Tunneler
 * Briarback Warcaller
 * Captain Razorspine
 * Earthbound Servant
 * Foreman Razorgnarl
 * Hulking Kraulguard
 * Panicked Tunneler