Imperial Plate

The Imperial Plate is an 7-piece armor set with heavy stamina and strength bonuses, crafted by Blacksmithing.

Source
All items are crafted via Blacksmithing

It takes 135 Thorium Bars to get all the plans. Once a blacksmith has all the plans, it takes the following materials for a full set:

114x Thorium Bar, 12x Rugged Leather, 1x Star Ruby