- Plans: Invulnerable Mail
- Requires Blacksmithing (300)
- Item Level 63
- Use: Teaches you how to make Invulnerable Mail.
- [Invulnerable Mail]
- Requires Arcanite Bar (30) Enchanted Thorium Bar (30) Huge Emerald (6) Azerothian Diamond (6)
- 1 Charges
This item is a world drop, mostly noted from Eastern Kingdoms and Kalimdor bosses, but also noted as having been seen in Eastern Kingdoms and Kalimdor raid instances.
When first introduced, using this item required Armorsmithing specialization. This requirement has since been removed.