Cord of Elements

Part of the Shaman-aimed armor set called The Elements, a Dungeon Set 1 gear set.

Source
This item drops from the following mobs in Blackrock Spire:
 * Rage Talon Flamescale
 * Scarshield Warlock
 * Firebrand Pyromancer
 * Quartermaster Zigris
 * Firebrand Invoker
 * Bloodaxe Evoker
 * Smolderthorn Witch Doctor

As a quest objective
This item is an objective for quest Just Compensation.

Please see the Dungeon Set 2 page for a walkthrough on upgrading your Set 1 pieces to Set 2.