Vest of Elements

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

Source
This item drops from General Drakkisath in Blackrock Spire.

As a quest objective
This item is an objective of Saving the Best for Last.

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