Witherbark Skull

Witherbark Skulls drop from the following Witherbark trolls in the Hinterlands:
 * Witherbark Caller
 * Witherbark Sadist
 * Witherbark Scalper
 * Witch Doctor Mai'jin
 * Witherbark Venomblood
 * Witherbark Zealot
 * Witherbark Hideskinner

As a quest objective

 * Grim Message

As an ingredient
This item is used to make Nimboya's Laden Pike.