The Eye of Divinity

The Eye of Divinity can be found inside the Cache of the Firelord.

As an ingredient
This item is used to make:
 * Benediction

Easter Egg
Equiping this trinket in the World's End Tavern in Shattrath City will allow priests to see Ricole Nichie standing next to Haris Pilton.

It is likely the priestess mentioned in the flavor text is Eris Havenfire, whose spirit battles the undead in Stratholme and is involved in the quest to make Benediction.