Righteous Orb

A white sphere, filled with the holy power of righteousness. Used in crafting.

Source
This item drops from humanoid mobs on the Scarlet side of Stratholme, with a drop chance of about 5%.

As an ingredient
Righteous Orb is used in the following recipes:

Blacksmithing

 * Arcanite Champion
 * Girdle of the Dawn
 * Gloves of the Dawn

Tailoring

 * Truefaith Vestments

Enchanting

 * Enchant Weapon - Crusader
 * Enchant Weapon - Healing Power
 * Healing Power (gloves enchant)

As a quest objective

 * The Dread Citadel - Naxxramas