Part of the Beastmaster Armor set:

The set gives these bonuses as more pieces are worn: 2: +8 All Resistances. 3: Restores 8 mana per 5 sec. 4: Your melee and ranged autoattacks have a 5% chance to energize you for 200 mana. 5: When struck in combat has a 8% chance to remove a Root effect from yourself. Can only occur once every 60 sec. 6: +40 Attack Power. Set Details | All Sets