Hoodoo Hex

Hoodoo Hex is used on leg and head armor to permanently increase stamina, and spell power.

Source
Hoodoo Hex is a quest reward from the quest Hoodoo Hex which starts with Zanza the Restless in Zul'Gurub. To complete the quest, you must turn the following items to Zanza the Restless:
 * 1 Primal Hakkari Idol
 * 1 Punctured Voodoo Doll (warlock)