Enchanted Thorium Breastplate

The Enchanted Thorium Breastplate is a crafted plate chestpiece made by a high-level Blacksmith. The bonus to defense makes this good tanking chest armor.

Source
The Enchanted Thorium Breastplate is crafted by Blacksmiths with a skill level of 300.

The components are:
 * 8 Arcanite Bars
 * 24 Enchanted Thorium Bars
 * 4 Essences of Earth
 * 4 Essences of Water
 * 2 Huge Emeralds
 * 2 Azerothian Diamonds

The plans are a reward when you turn in to Lorekeeper Lydros in Dire Maul.