- Plans: Thorium Leggings
- Requires Blacksmithing (300)
- Use: Teaches you how to make Thorium Leggings
- Requires Thorium Bar (12)
- 1 Charges
This item is found as a world drop from level 50+ creatures, most commonly level 55+ elite creatures in instances. It is relatively common to see it for sale in the Auction House.
Since Patch 3.1.0 it can be learned at blacksmithing trainers.