Warmaul Skull

Source
This item drops from:
 * Warmaul Warlock in Nagrand
 * Warmaul Reaver in Nagrand
 * Cho'war the Pillager in Nagrand
 * Warmaul Shaman in Nagrand
 * Warmaul Brute in Nagrand

As a quest objective
This item is an objective of Gurok the Usurper (quest).