Part of the Predator's Armor set:

The set gives these bonuses as more pieces are worn: 2: +20 Attack Power. 3: Decreases the cooldown of Concussive Shot by 1 sec. 5: Increases the duration of Serpent Sting by 3 sec. Set Details | All Sets

Quest Reward from:

Level	Name	Start	Rewards
60	Paragons of Power: The Predator's Mantle  (Raid) Horde and Alliance Zul'Gurub	Falthir the Sightless Stranglethorn Vale	6600 XP