Part of the Freethinker's Armor set:

The set gives these bonuses as more pieces are worn: 2: Restores 4 mana per 5 sec. 3: Reduces the casting time of your Holy Light spell by 0.1 sec. 5: Increases the duration of all Blessings by 10%. Set Details | All Sets

Quest Reward from:

Level	Name	Start	Rewards
60	Paragons of Power: The Freethinker's Armguards  (Raid) Horde and Alliance Zul'Gurub	Jin'rokh the Breaker Stranglethorn Vale	6600 XP