Presence of Sight

Presence of Sight is used on leg and head armor to permanently increase spell power and chance to hit with spells.

Source
Presence of Sight is a quest reward from the quest Presence of Sight (quest) 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 (mage)