Ironvine Belt

The Ironvine Belt is a plate belt that gives a bonus to stamina, nature resistance, and overall defense.

Source
The Ironvine Belt is crafted by Blacksmiths with a skill level of 300.

The components are:
 * 6 Enchanted Thorium Bars
 * 2 Living Essences

The plans are sold by Vargus in the Cenarion Hold. You must be Friendly with the Cenarion Circle to purchase these plans.