Acidic Venom Sac

Acidic Venom Sacs drop from the following spiders in Dustwallow Marsh:
 * Darkfang Spider
 * Darkfang Venomspitter
 * Darkfang Lurker
 * Giant Darkfang Spider
 * Darkfang Creeper

As a quest objective
This item is an objective of The Black Shield (Horde).