Foul-Smelling Flask

Foul-Smelling Flasks drop from the following quilboar in Stormsong Valley:
 * Briarback Geomancer
 * Briarback Lookout
 * Briarback Packmaster
 * Briarback Warcaller
 * Hulking Kraulguard

Quests

 * Anger in a Bottle